MBP temperature when on battery power

Is it normal that my MBP runs so hot when on battery power that I cannot even use it on my lap? It seems like most of the heat is coming from the area below the top 3 rows of keys (if that makes sense) and not the battery itself.

Yes, the case is a heat-sink; Apple call them "notebooks" not "laptops" and warn against having them against your skin.
"Do not leave the bottom of your MacBook Pro in contact with your lap or any surface of your body for extended periods. Prolonged contact with your body could cause discomfort and potentially a burn"
MacBookPro_UsersGuide page 107
Actually, you don't want heat near the battery itself as that's not good for li-ion, that should feel relatively cool?

Similar Messages

After Installing More Ram, MBP Crashes When Using Battery Power

I own a 2.16 Ghz MBP. Last night, I installed 4 Gigs of ram (2x2 Gigs)purchased from crucial.com into my MBP. (Yes, I realize that the MBP only utilizes about 3.3 Gigs of the ram, but I wanted the benefits of running with a matched pair).
After installing the ram, my MBP recognizes the new ram and everything seemed fine. And, it was fine until I unplugged the MBP's power and went mobile. Then, after a few minutes of use, the MBP completely shut down and turned off. I tried turning it back on, but it would not. So, I plugged the MBP and it booted up fine. I unplugged it again, and again, after a few minutes of use, the MBP shut down completely. Being that the battery was fully charged, I don't know why it would behave this way.
Any way, anybody have any ideas as to what might be wrong?
Message was edited by: No Exit

No Exit wrote:
I own a 2.16 Ghz MBP. Last night, I installed 4 Gigs of ram (2x2 Gigs)purchased from crucial.com into my MBP. (Yes, I realize that the MBP only utilizes about 3.3 Gigs of the ram, but I wanted the benefits of running with a matched pair).
After installing the ram, my MBP recognizes the new ram and everything seemed fine. And, it was fine until I unplugged the MBP's power and went mobile. Then, after a few minutes of use, the MBP completely shut down and turned off. I tried turning it back on, but it would not. So, I plugged the MBP and it booted up fine. I unplugged it again, and again, after a few minutes of use, the MBP shut down completely. Being that the battery was fully charged, I don't know why it would behave this way.
Any way, anybody have any ideas as to what might be wrong?
Message was edited by: No Exit
It sounds as if you have a defective battery. I would call Apple and explain your MBP's symptoms. If the battery is swollen it is likely a candidate.

My i phone 3g turns it self off when the battery power gets to about 50 % is there a few for this?

My i phone 3g turns it self off when the battery power gets to about 50% is there a fix for this

This is often due to faulty battery. Make Genius reservation and take iPhone to Apple Store for free quick battery diagnostic testing.

Laptop randomly switches off when on battery power.

When on battery power my HP DV3500EA laptop randomly switches off (this is only a recent problem). This is when there is still significant charge on the battery. This does not happen when on AC power. Once it has switched off, the laptop is able to be switched back on again and run normally until the next time it switches itself off. It doesn't shut down, it just turns off immediately as if the battery has run out. I have checked that it is not overheating - the CPU temp is generally between 40 and 50 degrees Celsius. I know this isn't a software problem because it does this on different operating systems (Windows Vista and Ubuntu Linux). I assume this means it must be a hardware problem, but I can't work out what it is or how to fix it.
Does anyone have any ideas?

Exact same problem with my Envy 13 running with windows 7... any solution besides bringing the laptop back to the store?

MBP (13-inch, early 2011) goes into hibernation instead of safe sleep upon closing the lid (only when using battery power)

MBP details
13-inch MacBook Pro, early 2011 (model identifier: MacBookPro8,1)
Running Yosemite, OS X 10.10.1 (however, problem started while using Mavericks)
2.5 GHz Intel Core i5
4 GB memory
Symptoms
* the MBP goes into hibernation instead of sleep upon closing the lid on battery power (i.e., when AC adapter is NOT connected)
-- problem does not occur when AC adapter is connected
* putting the computer to sleep by other means does not induce the problem; these other means include:
-- [i] option+command+Power,
-- [ii] Apple Icon --> Sleep,
-- [iii] in Terminal: pmset sleepnow
* the battery is NOT getting drained at all; if I close the lid on 87%, the battery is still at about 87% when I get the MBP back up and running
To be as clear as possible:
(1) MBP is on and in use (power source: battery); battery is at X%
(2) the lid is then closed
(3) the battery indicator light glows bright for about 10 seconds, then shuts off, and with it so does the MBP (all fans and sounds cease)
(4) opening the lid and pressing any key on the keyboard does nothing (the computer is not sleeping)
(5) to turn the MBP back on, I must hit the power button once; this brings up and the gray screen and loading bar indicative of returning from hibernation
(6) log in; battery is still at X%
Attempted Solutions / Fixes
There are Apple Discussions addressing similar MBP issues, many of which at least have work-arounds, if not full-blown solutions. However, I have tried many of the proposed work-arounds and solutions; nothing has solved my problem. Such attempted solutions include:
* made sure EFI/SMC firmware was up to date
* updated all software
* logged in as a different user
* booted in Safe Mode
* reset the PRAM
* repaired disk permissions using Disk Utility
* repaired additional disk permissions in recovery mode (a la this chron.com advice)
* ran the Apple Hardware Test multiple times (short test while plugged in, short test on battery, extended test while plugged in, extended test on battery)
* booted from an external known-good OS on USB drive
* reseated the RAM
* used MemTest to test the RAM's health (it was good)
* tested my battery's health with the app Battery Health (it is healthy!)
* booted my computer with one stick of the MBP's original RAM at a time (figured "why not?")
* booted my computer using other sticks of RAM
* checked my power management settings using PMSET in the terminal (e.g., pmset -g); tried various hibernation modes (e.g., sudo pmset -a hibernationmode X, where X=0,1,3, etc)
* searched/grepped through my power management logs and Console messages to look for googleable items (e.g., pmset -g log | grep WORD, where WORD=failure, sleep, etc); still have not found help online
* brought the MBP to a Mac Genius
-- he ran some further tests, but found nothing;
-- he re-installed my OS as a hopeful-hail-mary-just-maybe-last-ditch effort; the problem persisted!
-- we both agreed that we had ruled out a software cause
-- he offered me to leave my MBP to get fixed for a flat fee of $300.00 (which after a couple weeks of trying to figure this out is starting to sound more and more reasonable)
Given that it is likely not a software issue, what hardware might it be? By booting from an OS on an external drive, I think I've ruled out a bad hard drive or hard drive cable. Also, given that inducing sleep in any way other than closing the MBP's lid does not cause the problem, it seems there might be a wire (or something) in the hinge section of the MBP that gets moved when the lid is closed possibly causing some kind of short circuit...or something.
If someone with more experience interpreting Console messages, for example, can help, I'd be happy to provide some logs, or any additional information.
Thank you for your time and consideration.

Ok, this is a crazy-simple, quasi-embarrassing fix, but I'll post it anyway just in case anyone is having a similar problem (for example, this guy: Changes to pmset being ignored).
Some time around late last August / early September (2014) this issue began happening for me (specifically, issue = closing lid while on battery power induces hibernation / shut down instead of sleep --- independent of hibernation mode). Maybe it was when I upgraded to Yosemite (not sure what the exact date of that was). As detailed in my original post, I frantically tried everything I could think of... At that time, however, I had quite a few presentations and posters to create and present at meetings and conferences, so I held off fixing it for a couple of months and returned to it this past week, where I tried a few more things listed above, but again to no avail...
This morning, I simply tried fudging around with all my power management settings again (via pmset in Terminal). The simplicity of the fix surprised me. But now that I understand it, I know it is likely the same fix for other threads I've read, such as the one above:
(TLDR in bold)
(1) Take note of your power management settings (Terminal: pmset -g custom)
(2) Is the "standby" flag set to 0? If so, set it to 1. Wa-la! Done.
This fix is crazy and embarrassing b/c I was so close to it for so long. I tried changing my hibernation modes multiple times (sudo pmset -a hibernatemode X, where X=0,1,3,25,etc). I read about manipulating other PMSET settings that helped other people with newer MBPs, like "autopoweroff" and "autopoweroffdelay" --- settings that I do not have on the MBP early 2011 (check your settings: pmset -g cap). And most amazingly of all, I even messed with the "standbydelay" setting, trying to make it so long that my computer should never go into hibernation... Yet, from what I can tell by looking over my notes, I never simply set "standby" from 0 to 1.
There are interesting questions that arise due to this fix. For example, why did this problem persist on clean installs of OS Yosemite? Is "standby" being set to 0 the Yosemite default? I'm not sure. If it is, then Kappy was right: this was normal behavior... It just wasn't always the normal behavior...at least not for my MBP. Normal behavior (hibernatemode 3) used to be (and now is again) that the MBP goes into safe sleep, and then only after an allotted amount of time will it go into full-blown hibernation.
NOTE: the "standby" and "standbydelay" PMSET settings are not available in some earlier MBP models (e.g., my brother has a 2010 and does not have these settings); so if you're having a similar problem with an earlier model, this fix might not be of any help to you.

MBP running out of battery power before sleeping - Help!

Hi
My MacBook Pro has been running out of battery power before the memory-saving sleep mode kicks in, so it dies with a little click of the HD. It's not a hibernation state as when I reattach the power supply it boots up a new session.
I've noticed this since upgrading to Snow Leopard last year, but put it down to an old battery that had 45% charge and wasn't powering the MBP properly. I now have a replacement A1175 5600mAh battery which is giving me 2-3hrs usage (which I'm pleased at), but now it still dies before sleeping!
I have tried to cycle the new battery, but can't. I have reset the SMC several times, with no effect.
I used to cycle the battery every week or two, running it down until it would no longer wake from sleep, recharge overnight etc, but now I can't do this because it will die before sleeping!
I've read quite a few articles over the net about this issue, but there seems like no cure. It's really annoying me now as I frequently work on the move and a dying MBP could potentially be disastrous.
Can anyone shed some light on this issue? Is there something I haven't tried yet? I think it's a late '06 MBP.
From System Profiler:
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro2,2
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 3 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP22.00A5.B07
SMC Version (system): 1.12f5
Battery Information:
Model Information:
Serial Number: ˇ{ïwl"Ó*%#Û˙� $«\
Manufacturer: SMP
Device name: ASMB012
Pack Lot Code: a0b0
PCB Lot Code: c0f1
Firmware Version: 8800
Hardware Revision: 0000
Cell Revision: 0000
Charge Information:
Charge remaining (mAh): 1320
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 5315
Health Information:
Cycle count: 12
Condition: Normal
Battery Installed: Yes
Amperage (mA): 1500
Voltage (mV): 11560
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: No
Current Power Source: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 0
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: No
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
ID: 0x0100
Wattage (W): 85
Revision: 0x0000
Family: 0x00ba
Serial Number: 0x001e1900
Charging: Yes

If you are not getting a warning, then there is something amiss with your battery. If a SMC reset and calibration does not fix the problem, then you may need to make an appointment at the genius bar and arrange to have your battery tested.
My old battery started doing the same thing--shutting down without warning. I replaced it, and the replacement battery started doing the exact same thing. I then returned the replacement, and the next replacement battery behaves in a normal fashion.
My first battery was worn out. My second battery was defective. My third battery is good.
Your battery should still be under warranty. Go back to where you got it and show them what it is doing and see if you can get a replacement.
Good luck!

Re: Qosmio F50-126 - Freezes when on battery power

*hey everyone*
I bought my Qosmio F50-126 couple of months ago with 3 year international warranty. There is something about the notebook which really irritates me--- *THE FREEEZEE*.
I have noticed that when I am watching a video on any player and any format, the whole computer freeezess *for 1 or 3 seconds and resumes* by itself *But the interesting thing is that it ONLY happens when running on battery*. It runns like a dream when running on ac with battery being charged. *IT INCREDIBLY annoying*
When your into the movie and lights are off and your in ur comfly warm bed. The WHOLE computer freezes with the audio jittering. It only happens for 1 or 2 seconds but it occurance is *COMPLETLY RANDOM.* If the laptop is in the mood of watching the movie it only freezes 2 or 3 times but sometimes it just get on my nerve.
I disabled my kaspersky and other random process runing. Please help me!
*Just for the note: It only happens the freeze only happens when running on battery*. Oh- hope this help
I notices that my HDD light on the notebook doesnt blink that often when on battery and playing the video so its not the load time the reason... also...SAME RESULT WHEN I RUN ON HIGH PERFORMACE, BALANCED or power saver---actually powersaver is *_THE WORST.... BYE... PLESE HELP ME OR MY LIFE IS DOOM_*

hey-- i'm amazed with the quick reply.. thank you.. okay back to the notebook
Yes, i did install nvidia driver from there website, 9700M GTS driver. The lastest one there is. You are correct about the heating problem but i believe its with all the qosmio because after reading a thread on it about the GPU temperature, i think it normal which it shouldnt be. Like, when doing normal work, the gpu temps hovers around 60 C but when playing game,, max it reached was 105 C when ruinnin the game at max performancel. Forexample, farcry 2 when on ultra high runs smooth with the gpu temp around 101 but when everythikng low,, back to 'normal' temp 60. But the gpu temp isnt mine concern. My concern is the freeze. So you mentioned about Toshiba Display Driver and i will give it a test and see if makes any differnce. I hope it does but i'm afraid it might downgrade my graphic power frame rates but i will still give it a go and see if it makes any diference. Also, sometimes, my display driver stops working, the nvidia website downloaded driver.
And final answer to the second post,,, umm..i dont remember,, its just these few days its getting on my nerve and decided to post a thread on the internet.
hope this helppp... so..im goin to toshiba driver and download the display driver and see if that make a differnce.i hope it does..
bytheway... only thing i dont understand is why doesnt it freeze my runin on ac?

Macbook Pro powers off when on battery power

Help! My MBP 17" now powers off after a couple of minutes on battery power. When this happens, trying to boot again, the system will power off again while loading the OS. The only way to get the MBP to boot then is to plug in the AC adaptor.
I've reset the SMC and reconditioned the battery. Both the OS and the battery think the battery is fully charged. This didn't happen before upgrading to Leopard.

I believe the color of the magsafe was green and that it wasn't charging. (The MBP thought the battery was at 96%.)
Here's the profile after I got to work and plugged in my magsafe (which is a second magsafe I keep at work), the color is amber:
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
Charging: Yes
Battery Information:
Model Information:
Manufacturer: SMP
Device name: ASMB014
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0202
Cell Revision: 0100
Charge Information:
Charge remaining (mAh): 5048
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 5472
Health Information:
Cycle count: 97
Battery health: Good
Battery Installed: Yes
Amperage (mA): 469
Voltage (mV): 12390
After charging, the magsafe is green and this is what profiler says:
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
Charging: No
Battery Information:
Model Information:
Manufacturer: SMP
Device name: ASMB014
Pack Lot Code: 0001
PCB Lot Code: 0000
Firmware Version: 0102
Hardware Revision: 0202
Cell Revision: 0100
Charge Information:
Charge remaining (mAh): 5472
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 5472
Health Information:
Cycle count: 97
Battery health: Good
Battery Installed: Yes
Amperage (mA): 200
Voltage (mV): 12368

Unreliable WiFi connections when on battery power

I've had my MBP for 2 weeks. It worked flawlesly for the first 10 days. Since then, when running on battery power, my WiFi connection drops repeatedly, and at random intervals. Signal strength is good always (on a/c pwr or batt) and I am always able to reconnect via the menu bar by re-selecting my network.
I believe that this started happening after the latest updates were downloaded and installed.
Again, this only happens when running on battery power...
Any ideas?

This is an issue that has appeared in many threads. It looks like OS X Tiger has a driver issue with certain wireless APs - something related to power management.
In my case, I had no trouble with my Netgear AP but when I recently switched to a Linksys running DD-WRT open source software, I would drop my connection on battery every 2 minutes or so.
Same computer using Windows has no drops. I have not seen any press that Apple has admitted to the issue.
Until then, use the workaround that has been suggested. Run the Cococonut Wifi. This is a menu-bar utility that shows a count of open APs in the area. However, the side-effect is to keep the wireless driver open and stop the disconnects. It worked for me. The URL is: http://coconut-flavour.com/coconutwifi/index.html
Enjoy...

Random Shutdowns when on Battery Power

Hello!
My Macbook Pro is about 2 years old and it seems to be randomly shutting down when the battery is at about 40%. This has happened twice in the past 3 days. Both times, when the battery was at about 35-45% and was not plugged in with an adapter the computer would shut down without any warning and wouldn't turn on again unless it was plugged in. Once it restated (the full boot up) no applications acted as if they had "crashed" (though, thankfully I was never in the process of working on something, just browsing the internet), and Firefox, when reopened, opened up all my tabs as before the system crashed. Also, once it restarted the battery wasn't depleted and still showed about a 45% charge.
To complicate matters, the computer doesn't die every time the battery reaches 35-45% (one of those days it decharged fully and gave me the reserve battery warning as usual), so it doesn't seem to be a dead cell in the battery, if I understand correctly. The first time it randomly shut down was 3 days ago. Earlier today my computer decharged fully and gave me a reserve battery warning, at which point I plugged it in. However this evening it again died on my at 45% battery life, I restarted it by plugging it in, and then as an experiment unplugged it once it had started up. In the next 10 minutes it shut down once more.
I've removed the battery and there isn't any dust or grime, so that's not the problem as far as I know.
My battery information in the System Profiler comes out like this:
Charge Information:
Charge remaining (mAh): 1731
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 2547
Health Information:
Cycle count: 125
Condition: Check Battery
So, is my battery dead or in the process of dying and I should consider replacing it? I'm still a little fuzzy on how cycle counts work, but 2 years seems like not a lot of time before replacing a battery.
Maybe my computer is overheating (I do have a case on it, but it should ventilate correctly)?
Or perhaps it has a virus? Though I have Norton Antivirus and it runs scans about 3 times a week and has not found anything ever.
I'd like to get this sorted out so I don't have to be paranoid about loosing my data in case I ever am working on something. And I'd really like to not have to plug it in all the time (I'm a college student...plugging it in everywhere on campus can be a pain in the ***).
Thanks!!

mybluehighways,
looking at your battery figures, your description of the computer's behaviour, and the age of the battery it is pretty clear that it has simply deteriorated to the point where it can no longer sustain normal operation.
The short answer is that you need a new battery.
The long answer is that when computers running on batteries shut down unexpectedly it is simply because the battery is not able to provide the transient power needed for a particular task or tasks. It usually occurs because the internal resistance in the battery has built up to the point where, though the battery can still store electricity, it can't deliver it sufficiently quickly to meet the demand.
It is like a car with plenty of petrol in the tank but a faulty fuel pump. It will trundle along quite happily on the flat for quite a while, but if you put your foot down to overtake or climb a hill the engine will stall because it can't get enough gas to meet the increased demand. At this point you can choose the dangerous option to keep on driving on flat roads only, and to never overtake anything or "put your foot down" to get out of trouble until the fuel pump dies completely (which you can be certain it will soon do), or you can get it fixed by getting a new one. The same applies with batteries, though you are "only" risking data loss and hard drive corruption with a computer, rather than your life!
The variation in the amount of time for which it ran before cutting out will simply be due to variations in power demand when doing different sorts of tasks. You will find, too, that the battery will cut out earlier and earlier, under lower and lower power demand situations, as it continues to deteriorate. (Once these batteries start exhibiting this behaviour you can be sure that they are well on the way out)
If you take your battery to an Apple AASP or Apple Store they can quickly test it for you, but if I were you I'd be preparing to buy a new one.
This has nothing to do with viruses or the like. It is a very common experience with the batteries in these MBPs when they are around a couple of years old. My own first battery in essentially the same model became problematic after 18 months.
Cheers
Rod
Message was edited by: Rod Hagen

T61 Buzz coming from upper left hand side when on battery power.

I have had 2 or 3 T61's exhibt the same problem. When the laptop is on battery power, I hear a very annoying buzzing noise coming from the upper left hand corner of the laptop. It seems to originate right next to the exhaust vent next to the speaker. Does anyone know what can be causing this? I have the most recent BIOS update as well. The second the unit is plugged back into A/C power, the sound disappeares.
Its driving me crazy!!

This is a hardware problem or glitch with the older Core 2 Duo processor, it was industry wide problem, there is no real fixes for it, other than to turn power saving features off and put the processor at max performance on battery.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

Randomly Shutting Off When On Battery Power

So, I recently had my logic board replaced because my built-in audio out port wasn't working. I had this done more than a week ago, but just 2 days ago I was using it without being plugged in for over an hour (the battery indicator said I had about 50 minutes left of power) and then suddenly, it just shuts down. I hit the power key, and hear the startup "ding", and then hear it shut down seconds later. I plug it in, and start it up, and it works fine. Then last night I was using it on battery power again, and when the battery said 57 minutes left, it just shut down.
Could this be from my new logic board?

Hi E,
Unlikely, but possible. More likely the batt is dying. Time indicators have never been known for their accuracy, and a batt starting to die increases that problem. Check the condition of the batt (Apple Menu:About This Mac:More Info:Power) and post back.
Message was edited by: tjk

Screen flicker when running battery power?

Hi MSI Fans!
Do you guys have the problem when your screen flickers very badly when running battery (unplugged)\
If mods know how to solve it, it is appreciated if you post here. Thanks a lot!

Quote from: Svet on 07-November-14, 06:09:31
try set gpu to max performance from control panel power profiles
note make sure to edit the right power profile which is used when the notebook is running on battery only
Quote from: DerekQ on 07-November-14, 06:53:46
KK I will do that the next time I will use the laptop but really, the battery life is bad and I have to use even more electricity to power the laptop to avoid flicker?
Hmmm it flashed right after a unplugged the computer but for some reason it isn't flickering, maybe when the battery gets low then it flickers? Since last flicker was just about 2 days ago.
Any advice?

When on battery power, my IPod Nano it shuts itself off after 2-3 minutes. Any ideas what is wrong and how to fix it?

Can anyone help me keep my iPod Nano from shutting itself down after 2-3 minutes on battery power? It works fine when connected to a power source.
Thanks,
George

Try here to fix it. I doubt that you will ever find out why it did that.
iPod touch: Hardware troubleshooting

File transfer speed when on battery power

Hey there - I've noticed that my file transfer speed is ridiculously slow when i'm not plugged in to a power source. Even when my battery is fully charged it's super slow. This happens not only when I'm uploading files from a memory card to my computer but when I'm attaching files to an email, or even sending an email. I've asked other mac users and they say this is not the norm for their machines....any ideas?
thanks!
Sunny

additionally, you can disable power menagement for your wireless card completely through iwconfig's power option. I suggest you read the manpage for iwconfig, I have quotes the 2 related options for you.
txpower
For cards supporting multiple transmit powers, sets the transmit power in dBm. If W is the power in Watt, the power in dBm is P = 30 + 10.log(W). If the value is postfixed by mW, it will be automatically converted to dBm.
In addition, on and off enable and disable the radio, and auto and fixed enable and disable power control (if those features are available).
Examples :
iwconfig eth0 txpower 15
iwconfig eth0 txpower 30mW
iwconfig eth0 txpower auto
iwconfig eth0 txpower off
power
Used to manipulate power management scheme parameters and mode.
To set the period between wake ups, enter period 'value'. To set the timeout before going back to sleep, enter timeout 'value'. You can also add the min and max modifiers. By default, those values are in seconds, append the suffix m or u to specify values in milliseconds or microseconds. Sometimes, those values are without units (number of beacon periods, dwell or similar).
off and on disable and reenable power management. Finally, you may set the power management mode to all (receive all packets), unicast (receive unicast packets only, discard multicast and broadcast) and multicast (receive multicast and broadcast only, discard unicast packets).
Examples :
iwconfig eth0 power period 2
iwconfig eth0 power 500m unicast
iwconfig eth0 power timeout 300u all
iwconfig eth0 power off
iwconfig eth0 power min period 2 power max period 4
website with the current manpage:
http://linux.die.net/man/8/iwconfig
or simply:
$ man iwconfig
Last edited by stefanwilkens (2010-09-13 11:11:37)

MBP temperature when on battery power

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