SG300-28P noise level... (fan control)

Hello,
May be somebody can help me. In official information for SG300-28p noise level is 40.6 dB, but in fact its too noisy. Is it possible to change speed of fans? I use only 8 PoE ports.
Thanks in advance,
Andrey

Hi Andrey,
I placed a sound meter within 6 inches of the Right hand side of my SG300-28P and found a average dB level of 47
I rested a sound meter on top of my SG300-28P and found a average dB level of 59-60dB .
I used my motorola atria phone in conjunction with a Sound Meter ver 1.4.3 dB meter app to perform the measurements.
My measurements were not done according to any standards based approach for measurements of sound level of machines.
Conversation in restaurant, office, background music, Air conditioning unit at 100 ft
60
Half as loud as 70 dB. Fairly quiet
Quiet suburb, conversation at home. Large electrical transformers at 100 ft
50
One-fourth as loud as 70 dB.
Library, bird calls (44 dB); lowest limit of urban ambient sound
40
One-eighth as loud as 70 dB.
reference :http://www.industrialnoisecontrol.com/comparative-noise-examples.htm
My unit is no more than 3 feet from my left ear, and I do not find the sound distracting..but noise/sound is subjective.
The fans on the SG300-28P are not adjustable.
regards Dave

Similar Messages

SG300-28p fan noise abatement

Is there a function or command to program the fans to "automatic" so that they only come on when the temperature becomes elevated? We find the noise level annoying. Thank you.

Hi,
The SG300-28p does not currently support automatic fan speed reduction.
Regards,
Jake

Fan noise level kills me - how to regulate fans using lm sensors?

I recently set up cpufrequtils using AMDs powernow-k8. Works awesomly - cpu frequency is at 1000 MHz right now.
Then I went and set up lm sensors. No flaws, runs.
But why won't my fans go off? This noise level kills me....
In my BIOS I set the (system) control temperature to be 50 deg C. I am running a passive cpu cooler. The system's temeparture is regulated entirely by system fans.
There would be no need to have the fans running right now. But still they run. Have a look at my sensors output:
[user@machine ~]$ sensors
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp: +34.0°C
Core1 Temp: +30.0°C
w83627ehf-isa-0290
Adapter: ISA adapter
VCore: +1.12 V (min = +0.00 V, max = +1.74 V)
in1: +6.34 V (min = +13.46 V, max = +10.08 V) ALARM
AVCC: +3.23 V (min = +4.02 V, max = +3.06 V) ALARM
3VCC: +3.23 V (min = +3.82 V, max = +4.08 V) ALARM
in4: +0.96 V (min = +2.04 V, max = +1.27 V) ALARM
in5: +1.20 V (min = +2.04 V, max = +1.02 V) ALARM
in6: +5.12 V (min = +6.53 V, max = +6.12 V) ALARM
VSB: +3.22 V (min = +3.06 V, max = +3.04 V) ALARM
VBAT: +2.93 V (min = +4.08 V, max = +3.06 V) ALARM
in9: +1.74 V (min = +1.53 V, max = +1.46 V) ALARM
Case Fan: 1506 RPM (min = 703 RPM, div = 16)
CPU Fan: 0 RPM (min = 703 RPM, div = 128) ALARM
Aux Fan: 1795 RPM (min = 703 RPM, div = 16)
fan4: 1875 RPM (min = 341 RPM, div = 16)
fan5: 0 RPM (min = 3515 RPM, div = 128) ALARM
Sys Temp: +32.0°C (high = -3.0°C, hyst = -65.0°C) ALARM sensor = thermistor
CPU Temp: +33.0°C (high = +65.0°C, hyst = +60.0°C) sensor = diode
AUX Temp: +41.5°C (high = +65.0°C, hyst = +60.0°C) sensor = thermistor
Is there anything I can do for the Case Fan, and Fans Aux and 4 to at least approximate their min RPM?

jacko wrote:
CPU Fan: 0 RPM (min = 703 RPM, div = 128) ALARM
I dunno, but from the looks of it I'd say u have the computer setup wrong. It doesn't even recognize the fact that u have a cpu fan, how do you suppose it should regulate that fan?
Did you read my post? Apparently not.

After downloading Lion the noise level of the fans increased. A noise which did not exist with Snow Leopard. Any ideas how to reduce noise?

After downloading Lion the noise level of (what I believe to be ) the fans increased. A humming noise which did not exist with Snow Leopard. Any ideas how to reduce this noise?

I have seen this mentioned a dozen times, here, on Lion,and MacRumors.
Nope. Usual suspects.
And whether you tried a clean install instead (backup and erase) and then use MA to import

Experiencing increased channel noise levels on PXIe4497 with 1071 fan on HIGH

I am using a PXIe-4497 to collect microphone data and when I switch the PXI chassis 1071e fan to HIGH setting, the noise level increases. The chassis is outside of an isolated test chamber, so the noise isn't occuring acoustically. Please see the FFT plot below of fan on AUTO (white trace) and fan on HIGH (red trace). Has anyone had this issue?
Attachments:
Background Measurement with PXI1071 fan on AUTO and HIGH.PNG ‏89 KB

There was some noise getting the pass through into the chamber. We added more sound insulation to block it out. Here's what it looks like with the added insulation (FAn on HIGH, white trace is with added insulation):
But as you can see there are ~256Hz harmonics. The data below is for MIC Y which is last channel the PXI-4492 (first module). The difference between AUTO and HIGH settings is now:
Here is MIC Z which is first channel input on the next module PXI-4497:
Auto and HIGH fan settings are close to being similar for MIC Z> Here are MICs X (white), Y(red), and Z (green) plotted together with fan on HIGH...X and Y are on PXI-4492 (last two inputs) and Z is on PXI-4497:
As you can see MIC Z doesn't have the 256Hz harmonics. We swapped the Z with the Y channels to see if it was MIC or channel related. Below is MIC Z in last input channel of PXI-4492 (where MIC Y was originally):
The noise follows the input channel, not the MIC. Here is the other side of the swap...MIC Y in first input channel of PXI-4497:
No significant change now between Auto and HIGH fan settings.
This seems to be input module related....
What now?

Do MacPRo mid 2010 models run with level fan noises or uneven whine?

Apple is replacing my mid-2010 mainly because of a disturbing modulating, up and down, fan noise problem. Not sure of the source. At first thought it was 5870 graphic card, but haven't been able to nail down exactly why.
They claim that these machines run with a very even level noise, and that this breathing or modulating noise is not the norm.
I have read that these machines, relative to earlier models, are quiet hummers, at least relatively.. Do most people with this year's model have machines running at a constant noise level or do the fan noises, even at idle, modulate and whine up and down, even with light usage...or on idle. I don't want a replaced machine with the same issue. I do work in a quiet environment, and don't mind the fan noise, but the modulations of up and down sound like a tunnel and I need to turn off the computer at times. Model is 3.2 ghz quad core, with ati 5870 graphic card.
thanks

I am very much interested in comparison here too. Unfortunately our local reseller doesn't have any Mac pros to compare (they deliver only when you make an order:(). So I have no other machines to compare...
So I've read a lot of forums and generally there's no simple answer anywhere. People say that their hdd/optical is making more noise than fans. That's true to my case. Hdd/optical indeed sound louder than fans. From the other hand, I work in very quiet environment (no street noise, no ventilation noises in the room or whatever) and my new Mac Pro sounds... well loud! Once again - relatively it is QUIET, I can hear older PC from the other room (and the 'other room' connects through a corridor so...). Still, a lot of people mention that they literally don't hear ANYTHING from their mac pros except for hdd/optical operation sounds. I do hear fan noise...
So i was wondering is my room too quiet/ear too sharp;) or is there some kind of a problem with the mac pro and I should bother contacting retailers?
Anybody here who can compare their mac pro's with say mac book pros? I clearly hear fans of my mac book pro (even being idle) in the main working room and mac pro is like 2-3 (may be 4) times louder than mac book pro. This might be OK for tower, but definitely it is not 'dead silent'...
So far I've even tried some iPhone decibel measurement apps (yeah it's not even close to 'pro' measurements but no other means are available to me at the moment). They doesn't notice mac book (most noise measurement devices as far as I've read don't count noises beneath 40 dB for good), but mac pro is about 42-43 dB while idle at some 10 inch from the machine and some 45-46 if I bring the mic like 3-4 inches to the case. Is it like OK or what? Unfortunately all Mac pros I've heard before where in environments where even my 42-46 dB would be completely lost, so i cannot judge if it is OK. It is still one of the quietest towers I've heard/owned but those posts about 'dead silent' and 'only hdd/optical' make me a bit uncomfortable...
Oh, and the modulation. Indeed idle operation has some modulation. As far as I can tell it comes not from varying speed of the fans but rather from how frequencies of the fans inside of the case are different and modulate when added to each other (like those FM/AM in the synthesizers). More to say, there are angles in a room where other frequencies are heard (probably reflections produce some additional modulations)...

Laserjet 5100Dtn - fan noise level / additional 500 page papertray

Hi all,
We've just upgraded our 4050n laserjet to a 5100Dtn laserjet.
2 questions:
- standby noise level: our 4050 is completely silent in standby; we're really amazed at the noise level of the 5100Dtn.
It's not excessive, but very audibly present.
How is your experience with the 5000 series in standby mode?
Could it be that something's wrong and our 5100 needs to enter 'deeper' standby? (We've set standby at 30 minute interval (shortest))
- Is it possible to add a 2nd 500 page papertray?
Our supplier has provided a second one, but it lacks the electrical pass-through connections. In other words to me it is a
'bottom' tray... Do these kind of papertrays exist at all, or is this only possible with 250 page trays?
Thanks for your help!
Erwin

Great opening post Carsten!
The latest bios:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-71252 (BIOS 66)
The FSB can be reduced from 133MHz to 100MHz using SetFSB, this also reduces the heat:
http://www13.plala.or.jp/setfsb/
clockgen = SLG8SP513V
If you add a shortcut to the startup folder the program will start at startup. Under properties you can change the target to:
"C:\Program Files\SetFSB\setfsb.exe" -s100 -b1 -cg[SLG8SP513V] -w20
So it starts with a FSB of 100Mhz, in the background, with the right clock generator, after 20 seconds.
Message Edited by quazar on 04-25-2009 05:07 AM

User-developed Fan Control for the S10(e)

Hello and welcome.
When you've searched the internet and found this thread, it's possible that you are an owner of a Lenovo Ideapad S10 or S10e which has a little problem with the behaviour and/or the noise of the fan. In this post you will get all the informations you need to handle this problem for yourself. It should also be the same on every S9/S9e.
Just a few comments before we begin:
This is not an official support or solution by Lenovo.
We are just normal users as you are, but we get rid of the fan and wanted to find a way to handle it. So if you want to try anything of the methods described here you have to know that you'll do all this only at your own risk. We are not responsible for any damages of your device. You should only use these methods if you know what you are doing.
Please note that this thread is only for discussing, improving, trouble shooting and perhaps extending the fan control utilities. Any general complaints about the fan problem itself should be placed in the original thread right here: http://forums.lenovo.com/lnv/board/message?board.id=IdeaPad_Netbook&thread.id=795. It already has 80+ pages (the link goes to the first page) and it is better to exclude all the fan control stuff because there it's very difficult to keep an overview.
Here you may post all of your questions, ideas/brainstorming, concerns, thanks and so on and you are really invited to participate and be an active member.
In this first part of this post I'm going to summarize all information about using a fan control utility. For any newbie it will be enough to read this post to get all necessary information. The second part does the same for developement of fan control utilities as we still have no known or working fan control utility for Linux, Mac OS X and other OSs I've forgotten - for now.
For getting started you need a S10 or S10e with an up-to-date BIOS. For the S10 it's the 90 67, for the S10e the 66.
The battery issue
Under very specific circumstances - that we haven't figured out yet - it might happen that your Lenovo S9/10(e) no longer detects the battery while using S10FanControl or S10Fan. It might occur after 2 minutes, it might occur after 2 months, it might never occur. It does not occur using Notebook Hardware Control.
It can be solved by removing the battery, waiting 10 seconds and put it back in. Then the battery is re-initialized and the detection works again.
S10FanControl - Windows
The first utility is S10FanControl created by user dresslerc. The current version is 1.0.0.1, available here: http://www.mediafire.com/file/yd5xmnrnijf/S10FanCtrl1.0.0.1.zip. After you've downloaded it you just have to extract it and start the .EXE in the "Release" folder. Here are the notes and the description dresslerc posted right here:
Everyone,
I've uploaded a version which everyone can use to test with. Remember this is still a TEST version although I think it works for the most part. It should work both on the S10/S10e.
Please install the .NET Framework 2.0 or later first.
Then click here to download the exe: http://www.mediafire.com/?jlg2enkjdxn
Once downloaded, extract the files and hit hte S10FanCtrl.Exe. Once this program launches you should be able to control the fan. Keep in mind that if you lower the fan speed then it'll take upto 30 seconds before the S10 registers the change, so be patient.
I've only tested this on the latest BIOS 59. I am sure it will work on the 57 as well but the individual speeds might not work properly on that version. Please try it out and report back.
The only issue that I heard so far is that occasionally the fan will kick in regardless if in Manual/Smart Mode. Also the temp it shows may not be accurate. If you find any other issues please let me know what they are so I can attempt to fix them.
Once we have all the kinks worked out then I will release the source.
Heres a quick Video: http://www.youtube.com/watch?v=_PKl70ZgmFg
REMEMBER: USE PROGRAM AT YOUR OWN RISK!!! I AM NOT RESPONSIBLE FOR ANY DAMAGES THIS PROGRAM MIGHT CAUSE.
Application Use:
BIOS Controlled - Fan is controlled by the BIOS
Smart Mode - Fan is controlled based on the conifguration in the options. You can set the threshold here at what temp you want the fan to kick in...
Manual - Fan is controlled manually by the slider.
If you want to have the program startup automatically, then place a shortcut of the app in the PROGRAM FILES -> STARTUP folder. Then you may want to go to the options and make the application minimize at startup.
Edit:
It seems there are some issues with the app and the S10e or previous BIOS versions. Will post a fix asap.
The source code for S10FanControl is available here: http://www.mediafire.com/?sharekey=7a3fb99d33817c08c2b435915e8821d7e04e75f6e8ebb871, written in Visual Basic .NET 2008.
S10Fan - Windows
The second utility is a tool written by user slash:
Hi guys,
Well it looks like Lenovo dropped this matter after all. Anyway, I have here another fan controller to add to the bunch. I have been using it for some time now without any problems. It is for both S10 and S10e.
What the program does is basically the same as others. The S10's fan speed is controlled according to the ACPI thermal zone temperature. By over writing the values which resides at offset 50h of the EC register at an appropriate timing, the ACPI thermal zone temperature is over ridden. The program is written in C and uses WinIo created by Sysinternals. The GUI version is available now.
It should be noted that the fan speed temperature thresholds differs with BIOS version. For 14CN67WW and 14CW90WW the fan changes speed at temperatures 60c, 65c, 70c, and 80c. Furthermore, the BIOS will automatically shutdown the S10 if the temperature reaches 90c.
The program has a fail safe mechanism that automatically disables itself if the actual ACPI thermal zone temperature goes above 85c. This allows the BIOS to regain control and the fan will work as intended by Lenovo. If the temperature drops below 85c the program will take over control again.
To run the program, you will need administrative privileges.
Known working BIOS versions: 14cn58ww, 14cn60ww, 14cn67ww, 14cn90ww
The program will work with any BIOS version as long as the BIOS uses the 50h EC register readouts to control the fan.
build 2009.05.24
Higher priorities for EC commands.
Usage: The program will run in the system tray. Double click or right click and use the menu to open the program. To determine the BIOS temperature thresholds, use the 'Setup' button. To run at boot time, place a short cut in the startup folder.
http://www.mediafire.com/file/njhz0icym2t/S10Fan.zip build 2009.05.23
Usage: S10Fan.exe
Added GUI.
build 2009.05.17
Usage: S10Fan.exe 60 65 70 80 70 75 80 85
S10Fan.exe test
The first 4 values are the BIOS temperature thresholds, the latter 4 are new thresholds that we want to over ride with. To determine the BIOS temperature thresholds, use the 'test' option.
build 2009.03.16
Usage: S10Fan.exe 70 75 80 85
-Slash
For updates and newer releases please check slash's post: http://forums.lenovo.com/lnv/board/message?board.id=IdeaPad_Netbook&view=by_date_ascending&message.i...
Notebook Hardware Control - Windows
The third utility is a profile for Notebook Hardware Control. I've adapted it from a profile for the Lenovo N500 which I've found here: http://nhc.yourcopy.de/overview/. With the manual for creating the profiles that can be found here: http://www.notebook-treff.de/board/database/hilfsprogramme-f%C3%BCr-nhc/92-how-to-create-an-acpi-fil... I was able to change the ACPI commands to work on the S10(e).
Installation and setup is divided in two steps. The program Notebook Hardware Control (NHC) is available at http://www.pbus-167.com/. Install the program, but do not start it for now. Then you need my NHCConfig utility, available here: http://forum.eeepcnews.de/download/file.php?id=1476. It detects your model number and BIOS-version via WMI and writes a proper S10(e) profile to the NHC acpi directory. The GUI is German if you have a German Windows and English if not. Additional languages can be added.
After you've extracted the ZIP-file you have to start the nhcc.exe (requires .NET Framework 2.0). At first a message appears that you use the program at your own risk. Then you can choose if you want to apply your own settings (experts) or if you just want the program to run with my defaults (newbies). In the settings window you can see your system details on the left, you can set up your thresholds in the middle and you can set the fan speed you want on the right. Then click on execute.
Now start NHC. Go to the "Settings" tab and click on "Show all NHC options and settings". Then a few more tabs appear. Go to the "ACPI" tab and check if the "ACPI Control System" is running (if everything works, the message "ACPI Control System running" will appear, otherwise it says "ACPI control system is not yet configured for this system"). Now click on "Show ACPI Control System details".
Here you can change the temperature values the fan control depends on (the settings from NHCC are the default values). On the bottom of the window you can see the "Current CPU temperature". That is the value you have to deal with. In general it has a value of around 60°C. In the middle you can see four user editable temperature values. You can leave the values as they are if everything works. The on/off values are responsible for the temperatures at which the fan starts running and stops again after cooling the device. The level values are responsible for the fan speed, for example you can set the off_level higher to let the fan run all the time at the lowest level, if the values do not fit for your device or whatever.
You can switch between NHC and BIOS control by disabling or enabling the "ACPI Control System" or by closing NHC.
Q:
A:
With every utility it is possible that it takes some time until you see an effect after you've started the program. Any failure of the programs should be no big problem because the only thing that should happen is that the BIOS controls the fan. Another issue that might occur due to the way the fan is controlled is that the fan may start running for a very short time and it looks like the fan control has lost control. The fan should stop immediately or at least after a few seconds.
Keep in mind that running the S10(e) with a fan control means that the S10(e) has to deal with higher temperatures. That could mean that the device will not last for 10 years but only 9 years (who uses a netbook so long...?). In every case you need a tool for monitoring your cpu temperature. We know that especially Core Temp 0.99.5 and Real Temp 3.00 do a very good job. That is important because the temperature values you need to set up the fan control are different from the values reported by the cpu sensor, they are between 15°C and 20°C higher. A normal temperature reported by the monitoring should be around 40°C, with the NHC default values the fan starts running at 52°C and stops at 38°C.
Q:
A:
Q:
A:
END using fan control
BEGINNING developing fan control
Controlling the S10(e)'s fan is a litte bit difficult because it looks like there is no way to control it directly. But it is possible to manipulate the temperature the BIOS fan control depends on. As long as the built-in fan control thinks that the cpu is cool enough the fan stays off. And that is exactly the point where we can attack.
The fan control depends on a field called RTMP in the memory of the embedded controller. It can be accessed via "_SB.PCI0.LPCB.EC0.ERAM", the offset of RTMP is 0x50 (hex) or 80 (dec). It is a direct I/O read/write. The complete NHC command for reading the value is: ACPI.FIELD.ReadByOffset("_SB.PCI0.LPCB.EC0.ERAM", ref value, 0x50, 8) with "value" as the variable which gets the value.
What program logic do you need? You need a timer or something else that conducts an always-refresh cycle. It sounds very easy: You read the value, manipulate it and write it back. And it is that easy, you just have to keep some things in mind.
This refresh has to be done very often. The procedure must be very thin and quick. Also the bus that is used to communicate with the EC is a problem, but since the S10e BIOS 66 it became a minor problem for me because it looks like the built-in fan control now depends on some kind of average value over the last few seconds and it doesn't really matter if one write-cycle is failing.
The read-event must be placed before the write-event. Otherwise you just read your manipulated value. The field is filled by the system regularly, so you just have to test if the read_value is different from the written_value, then you know that the field was filled with a "fresh" value. Like "if read_temperatue <> written_temperature then real_cpu_temperature = read_temperature else do nothing".
About the values you have to write back... you will have to test and play a bit. My experience is that you can select three fan levels, starting at 59°, 62° and 70° - at least with the NHC profile and my S10e it's like that. It's some trial 'n' error. My fan stays off at < 59°, but you should select a very low value for fan_off like 30°. In my opinion it switches off much faster the lower the written value is. But it's just a feeling, I haven't measured it.
Q:
A:
Q:
A:
Perhaps some users from countries with other languages than German and English can add tags for "fan", "control" and "noise".
Note from Moderator: Minor edits in title and disclaimer.
Message Edited by JaneL on 04-25-2009 02:32 PM

Great opening post Carsten!
The latest bios:
http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-71252 (BIOS 66)
The FSB can be reduced from 133MHz to 100MHz using SetFSB, this also reduces the heat:
http://www13.plala.or.jp/setfsb/
clockgen = SLG8SP513V
If you add a shortcut to the startup folder the program will start at startup. Under properties you can change the target to:
"C:\Program Files\SetFSB\setfsb.exe" -s100 -b1 -cg[SLG8SP513V] -w20
So it starts with a FSB of 100Mhz, in the background, with the right clock generator, after 20 seconds.
Message Edited by quazar on 04-25-2009 05:07 AM

SG300 - 28p does not work

good morning, nice to saludoarles, I write because I have a problem with a model SG300-28p switch, I explain:
had run the company normally switch until one day we were completely without a net, the teams showed "Network cable unplugged" apparently the switch was off, but the surprise is that when I check it was on but no light encendia.
disconnect it and made several tests like changing electric outlet, try connecting the console, etc. .. All these attempts have been unsuccessful. when connected to the electrical outlet and turn the fans back link and poe leds light about half a second, then go off, the same happens when I disconnect the feeding.
I am looking for help and see if you can get up and running again, best regards and thanks for your attention
Pd: disculpme if I do not understand well, because my English level is very low and I am supporting in translators online.

Hi John, It sounds like it is time to call SBCS support. It may need to be replaced. You may try to connect console cable and see if you see any interesting messages during boot.
http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html
-- please remember to rate helpful posts --

S10 noise level too high when closed

HI,
I just unpacked a new S10 6423 47G. I was startled by the noise level from the start and now that after completion of the windows setup the noise level has not gone down(I has hoping for a fan control issue), I have stopped further installation and am wondering what to do next.
The three fans seem ok and fairly quiet, I think the installation of the hard drive is also nicely solved.
When the unit is open the noise level is nothing great but ok. As soon as I put the side panel on, I have an increase in noise level that brings me over the tolerance treshold.
I am not sure about the reason, the panel is quite loose but when I press on certain or all parts there is no change in sound. It seems there is resonance in the entire case when I install the side panel. It starts even when the panel is not completey vertfical. In addition to the general noise level there also seems to be resonance of other frequencies as from time to time there is a humming with a frequency of a few changes a minute.
I am really disappointed, the "quiet like whipser noise level" (or so the ad went) was the thing that made me buy this computer without thinking much either about specs or price, I just wanted a reasonably quiet computer.
Any advice?
ThanksM.

Dear Brian,
thanks a lot for your info. I am relieved to see that the noise level is acceptable with your machine. That gives me hope.
FYI, I contacted Lenovo Germany and they were polite but not too helpful, they said that naturally this computer should be louder than a normal pc and did not want to hear much about the way the system is advertised as ultra-quiet. I do not believe in advertising promises but a moderately decent noise level i do expect.
I will return this unit to the dealer and order a new one - hoping that this is only a singular experience.
For me it is not an option to be unhappy with Lenovo - I like the Think series a lot and buy their notebooks all the time for business..
M.

Proper Fan-Control by Lenovo?

Hello Everyone,
two weeks have passed since i got my Thinkpad L530 and for the most part i am happy with it. But there is one issue which gets on my nerves:
- the absolute annoying pulsing of the fan !!!
For me one of the most important reasons to buy this laptop were the good test-results about noise-emission and battery-duration, because i use this laptop for work. Therefore annoying fan-sounds are unacceptable.
To solve this issue i have comb through serveral forum-threads and finally found a solution for my Win7-OS with TPFanControl. But i also use Xubuntu and on linux there are currently no working fan-applications for the SL- / L- and some E-Series
What i have read about i'm not the only one with that problem and that issue seems known for ages....so my question is:
- WHY do we still have to use third-party programs to get this problem solved, with the risk of breaking our hardware? Is it that hard for lenovo to offer a proper fan-control for their devices?
Greetings, Christian W.

ArchSoarer: thanks. This thread is almost a zombie, but I have tried your "acpi_osi=Linux" boot command. It does make the fan operate correctly EXCEPT where one suspends or hibernates, in which case I still get fan problems. I have outlined the situation here on our wiki: http://wiki.archlinux.org/index.php/Tos … llite_L300 and have a link there to an attempt to fix the issue by disassembling the DSDT. I have yet to go any further and attempt to fix the DSDT errors in this laptop. For the moment, because Arch boot quite quickly I simply do not use hibernate or suspend on that laptop.

Fan control in notebooks

Hi all,
I am using Arch Linux since a few months, right after purchasing my new laptop, a Dell Precision M3800. Anyway I am a linux user since many years. I like very much the control that arch give to the user in terms of configuration possibility. My question is relate to fan control in notebooks. Even though I noticed this issue in my laptop now, I think similar observation holds also for other notebooks and linux distros. For fan control I use the fancontrol utility. Once properly configured, there is a min temperature value below which the cpu fan is off (default is 20 °C, I increased up to 45 °C) and a max temperature value (default is 55 °C and I placed 65 °C) above which the fan is running at full speed. The reason for the temperature limit changes is to emulate windows behavior in terms of noise and thermal handling. With a room temperature in the order of 25 °C, I get right after login a cpu temperature of about 35 °C. Then the temperature increases even in idle conditions up to the limit of 45 °C and then it is stabilized by the cpu fan. Chaning the temperature between 35 °C and 45 °C simply changes the time interval I have to wait until the cpu fan switches on and cpu temperature stabilizes with low load. The point is the the stable thermal situation produces a continuous switching of the fan state, let's say the fan is on for a few seconds every minute. The reason is that the fan switches off right after the cpu temperature falls below the value for which it turns on. Wouldn't be better to define two different temperatures for switching on and off? Let's say, fan on when temperature reaches 45 °C and off when it falls below 40 °C. Is there a way to do that with fancontrol or same other tool?
Thank you in advance.
Bye,
Luca

OP, what you're describing is called (at least in HVAC circles) hysteresis. You may be able to find some fan control scripts that support it (googling fan control + hysteresis), or just write one yourself. You can also control this behavior to some extent by adjusting fancontrol's polling behavior (the "INTERVAL" setting), but that has risks.
I think implementing hysteresis is not a particularly useful endeavor because PC temperatures can change 30 degrees or more in a few seconds when under load, which is completely unlike, say, a home thermostat where temp changes are much more gradual over time. Realistically, you should expect to always be running at least the CPU fan at some speed, and set your "turn off" temperature for it to room temperature. You can set different temperature set points for different fans, so you can have the CPU fan turning off at a lower temp, but have other fans off until the temp gets much higher.
Last edited by mwillems (2015-05-31 16:35:48)

SG300-28P - POE not correctly supported on all ports - possible firmware or hardware issue

So, I spent some time this weekend troubleshooting the issues I've had with the new SG300-28P switch and POE to many of my devices in the office. As a recap, I cannot utilize all of the 24 POE ports on the switch for POE purposes. Really only every other port [with a few odd combinations thrown in between]. In addition, the SG300-28P switch, on occasion, is sending POE to non-POE devices [e.g. my Ruckus Zone Director 1106].
Here are my POE devices [all 802.3 af-compliant]:
3 Ruckus 7982 access points
1 Pakedge access point
2 home-automation controllers
2 Polycom voip phones
I called Cisco support several times in regards to this problem, and they figured it was a hardware issue - a faulty switch. So, Cisco sent me a replacement SG300-28P, which I hooked up today. The exact problem still occurs. Default configuration [fresh out of the box]. No way I can land, for example, the 3 Ruckus 7982 AP's on ports 1, 2, and 3 [or ports 1,13, and 2]. I have to put them on ports 1, 3, and 5 in order for them to power up. In addition, I can't plug any other POE devices on the ports either between or below them.   I had to skip another port bay. This is very odd behavior!!   Two Cisco SG300-28P's in a row with the same problem.
However, I also had one of the new Cisco SG300-10P switches in my possession for a recent project of ours. I decided to hook up the same POE devices to this switch. ALL POE devices were recognized and worked! No need to skip a port. And it didn't matter what device was plugged in first or not. I am now convinced that it is either a hardware issue [bad power supply/transformer?] inside all of the SG300-28P switches, or a firmware issue.
Both of the SG300-28P switches were running firmware 1.1.2 [the latest on Cisco's website]. So, I decided to install an older firmware version on the SG300-28P switch that I'm returning [installed 1.1.1.8].   Here's what I found out. I could then plug 2 POE devices [e.g. two Ruckus AP's] in adjacent horizontal ports, but not three in a row. In addition, not all adjacent ports. It's funky. For example, I could plug an access point in ports 20 and 21, but not in 21 and 22. No rhyme or reason in how it worked. And I still couldn't plug an access point in adjacent vertical ports [e.g. ports 1 and 13]. BUT...
It's interesting that the same exact switch that would not initially allow 2 horizontally-adjacent POE ports to be utilized WOULD allow 2 horizontally-adjacent POE ports to be utilized when running a different firmware version.   It's also interesting to note that when plugged into a "non-working" POE port, the SG300-28P would actually make a small whining noise. Very subtle noise; I could hear it when approx. 1ft away from the switch.   The noise was not noticeable when ports were skipped [and POE actually worked]. Therefore, I believe that Cisco has some SG300-28P firmware bugs [at least in the last two versions of firmware] that is not truly allowing all 24 ports to utilize POE correctly. This problem does not exist with the SG300-10P switch.
I'm really interested to hear what Cisco's reply and findings on this matter would be. And would welcome a reply from one of their senior support team members/managers who could actually experiment with this, too.   In addition, I'd like to know when they think a solution could be created if it's firmware-related. If hardware-related, I don't think I'll be recommending any 28P switches in our projects. Perhaps just the regular SG300-28 with a separate SG300-10P. It's a shame because the SG300-28P is more of a bargain when compared to the two separate components.

show power inline
Port based power-limit mode
Unit Power Nominal Power   Consumed Power   Usage Threshold   Traps
1     On      180 Watts     13 Watts (7%)          95         Disable
Port      Powered Device         State          Status    Priority   Class
gi1                               Auto            On      critical class0
gi2                              Never           Off        low     class0
gi3                               Auto        Searching   critical class0
gi4                              Never           Off        low     class0
gi5                               Auto            On      critical class0
gi6                              Never           Off        low     class0
gi7                               Auto            On      critical class2
gi8                               Auto        Searching     low     class0
gi9                               Auto        Searching     low     class0
gi10                              Auto        Searching     low     class0
gi11                              Auto        Searching     low     class0
gi12                             Never           Off        low     class0
gi13                             Never           Off        low     class0
gi14                             Never           Off        low     class0
gi15                             Never           Off        low     class0
gi16                             Never           Off        low     class0
gi17                             Never           Off        low     class0
gi18                             Never           Off        low     class0
gi19                             Never           Off        low     class0
gi20                              Auto        Searching     low     class0
gi21                             Never           Off        low     class0
gi22                              Auto        Searching     low     class0
[0mMore: , Quit: q or CTRL+Z, One line:                                                          gi23                              Auto        Searching     low     class0
gi24                              Auto        Searching     low     class0
show power inline gigabitethernet xx (for each device plugged in)
Port      Powered Device         State          Status    Priority   Class
gi1                               Auto            On      critical class0
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is on - valid resistor detected
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            3
Invalid Signature Counter: 17583
Port      Powered Device         State          Status    Priority   Class
gi2                              Never           Off        low     class0
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is off - user setting
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            0
Invalid Signature Counter: 0
Port      Powered Device         State          Status    Priority   Class
gi3                               Auto        Searching   critical class0
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is off - detection is in process
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            2
Invalid Signature Counter: 1
Port      Powered Device         State          Status    Priority   Class
gi4                              Never           Off        low     class0
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is off - user setting
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            0
Invalid Signature Counter: 0
Port      Powered Device         State          Status    Priority   Class
gi5                               Auto            On      critical class0
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is on - valid resistor detected
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            0
Invalid Signature Counter: 0
Port      Powered Device         State          Status    Priority   Class
gi7                               Auto            On      critical class2
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is on - valid resistor detected
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            0
Invalid Signature Counter: 0
Port      Powered Device         State          Status    Priority   Class
gi13                             Never           Off        low     class0
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is off - user setting
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            1
Invalid Signature Counter: 0
Port      Powered Device         State          Status    Priority   Class
gi14                             Never           Off        low     class0
Power limit (for port power-limit mode): 15.400W
Port Status:               Port is off - user setting
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            0
Invalid Signature Counter: 0
show interfaces advertise gigabitethernet xx (for what ports are of interest)
Port: gi9
Type: 1G-Copper
Link state: Down
Auto negotiation: Enabled
                                  1000f 1000h 100f 100h 10f 10h
Admin Local link Advertisement    yes    no     yes   yes   yes yes
Oper Local link Advertisement     -      -      -     -     -    -
Oper Remote link Advertisement    -      -      -     -     -    -
Priority Resolution               -      -      -     -     -    -
Port: gi10
Type: 1G-Copper
Link state: Down
Auto negotiation: Enabled
                                  1000f 1000h 100f 100h 10f 10h
Admin Local link Advertisement    yes    no     yes   yes   yes yes
Oper Local link Advertisement     -      -      -     -     -    -
Oper Remote link Advertisement    -      -      -     -     -    -
Priority Resolution               -      -      -     -     -    -
Port: gi11
Type: 1G-Copper
Link state: Down
Auto negotiation: Enabled
                                  1000f 1000h 100f 100h 10f 10h
Admin Local link Advertisement    yes    no     yes   yes   yes yes
Oper Local link Advertisement     -      -      -     -     -    -
Oper Remote link Advertisement    -      -      -     -     -    -
Priority Resolution               -      -      -     -     -    -
Port: gi21
Type: 1G-Copper
Link state: Down
Auto negotiation: Enabled
                                  1000f 1000h 100f 100h 10f 10h
Admin Local link Advertisement    yes    no     yes   yes   yes yes
Oper Local link Advertisement     -      -      -     -     -    -
Oper Remote link Advertisement    -      -      -     -     -    -
Priority Resolution               -      -      -     -     -    -
Port: gi22
Type: 1G-Copper
Link state: Down
Auto negotiation: Enabled
                                  1000f 1000h 100f 100h 10f 10h
Admin Local link Advertisement    yes    no     yes   yes   yes yes
Oper Local link Advertisement     -      -      -     -     -    -
Oper Remote link Advertisement    -      -      -     -     -    -
Priority Resolution               -      -      -     -     -    -
Port: gi23
Type: 1G-Copper
Link state: Down
Auto negotiation: Enabled
                                  1000f 1000h 100f 100h 10f 10h
Admin Local link Advertisement    yes    no     yes   yes   yes yes
Oper Local link Advertisement     -      -      -     -     -    -
Oper Remote link Advertisement    -      -      -     -     -    -
Priority Resolution               -      -      -     -     -    -

ATI Radeon X1900 XT Noise levels

Hi,
I'm considering a Mac Pro + 4GB RAM + ATI X1900 XT to run Apeture, based on the experiences & recommendations in this forum.
Can anyone comment on the noise level of the ATI X1900 XT compared with, say, the standard GeForce 7300 GT? I use my current Mac to run iTunes, as well as some other sound based apps that would suffer if the graphics card noise level was like a jumbo jet on final approach.
Does anyone have experiences here they can share?
I read in the forum that there is a possibility of a ATI Radeon X1950 XTX for Mac Pro that is quieter ... any truth in that?
Much appreciated.
Mac Mini Mac OS X (10.4.7) Canon DPP running on external 0.5TB Firewire drive

Can anyone comment on the noise level of the ATI
X1900 XT compared with, say, the standard GeForce
7300 GT? I use my current Mac to run iTunes, as well
as some other sound based apps that would suffer if
the graphics card noise level was like a jumbo jet on
final approach.
I have a MacPro 2.66 with the X1900 which was preinstalled in the system. The card is quite noisy but it is at an acceptable level. The reason you hear it is that the MacPro itself is very silent. Two components are competing which can make more noise: the harddisk (standard model with 250 GB) and the X1900. :-))
The sound from the X1900 is a constant fan noise which you are able to ignore while you work with this awesome machine. The performance of Aperture is simply great with this card even if I just installed 1GB of RAM!
Let me say it this way: If you want great performance for Aperture you should arrange with the fan noise of the X1900. Im convinced that we will see much more silent cards in the future which will give us the same performance. Then the time for a nice christmas present will have come! :-))

How should I set the parameters of PID Autotuning such as relay amplitude and PV noise level?

I want to control the temperature of a room by changing the hot water flow of a radiator with a control valve. The desirable control accuracy is +/- 0.5 degree of centigrade.
What number should I set for relay amplitude? And what number should I set for PV noise level?

Hello loghmani,
If your output is saturating try to reduce your relay amplitude and/or reduce the gain Kc of the PID controller before starting the autotuning procedure. You can find more information about each of the parameters that you've inquired about at this KnowledgeBase article.
I would recommend taking a look at the General Auto PID Simulator.vi example. You can find this example by doing a search in the example finder or by clicking linked example at the bottom of the detailed help page of the Autotuning PID.vi.
If you haven't looked at the PID user manual that also contains useful information on setting up PID algorithims and Autotuning.
David A
National Instruments
FlexRIO Product Support Engineer

SG300-28P noise level... (fan control)

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