VLC audio problems on T400 - DPC Latency Issue?

Hi Folks,
When I try to use VLC player to play any video on my T400, I get audio stutters and other strange effects. I'm wondering if it might have to do with all the audio DPC Latency issues this model has had. Does anyone else have these issues? Windows media player seems to work just fine, by the way. DPC Latency is high when either program is playing, but remains high when VLC has paused playback (whereas windows media player doesn't induce high DPC Latency when paused).
I've tried tweaking the buffer of VLC player, and a million other things, but nothing seems to help. Hence my suspicion of DPC Latency issues.
Thanks,
Allie
2764-CTO, Win XP Pro SP3, 2.8 GHz Dual Core, 3 GB Ram, 320 GB HDD, ATI Radeon 3450 w/ 256 MB, all drivers updated

Just upgraded to Win 7, and the problem's gone. Must be an XP driver of some sort.

Similar Messages

*Solved* MSI P43 Neo-F DPC Latency Issue - Latest BIOS Fix

Hi, I'd like to avail of the latest BIOS fix for the DPC latency problem on my MSI P43 Neo-F (MS-7519) 1.0.
I'm currently using BIOS 1.9, I haven't flashed to 1.A yet. Does 1.A include a fix or is there another BIOS that's as up-to-date as 1.9 or 1.A that would have the fix, with any links to download? I'm thinking along the lines of the A7519ICI.1xx series, whatever is the latest.
Thanks in advance.
EDIT: I have contacted MSI at http://ocss.msi.com.tw/
I don't suppose there is any links to the latest A7519ICI.1xx BIOS that I can avail of outside of the private MSI FTP server?

Thanks all for the advice.
OK, so here's the story. I couldn't relax with those voltages showing up as they were, so I flashed my BIOS to A7519IMS.1A0 (1.A), which is the latest public release for the P43 Neo-F. I was previously on A7519IMS.190 (1.9) before today.
When I flashed to A7519ICI.104, I noticed the version number was actually 1.10B4 (which I'm guessing can actually be expressed as 1.AB4 - a beta version for the latest public release, 1.A). The flash to A7519ICI.104 solved the DPC Latency issue, as when I used A7519IMS.190 (1.9) it was spiking.
There is a happy ending. The flash to A7519IMS.1A0 (1.A) has also shown no spikes in the DPC Latency test. It seems the fix must be present in the latest public release BIOS for the P43 Neo-F after-all!
This screen-shot was taken just a moment ago, proof that the issue has been resolved without a modified BIOS:
Hope this helps anyone else out who is using the same motherboard and experiencing the same issues. Just get the latest public BIOS. No hassle!
http://www.msi.com/index.php?func=downloaddetail&type=bios&maincat_no=1&prod_no=1484
Please make sure that your motherboard is in-fact the MSI P43 Neo-F (MS-7519) before you flash the BIOS with any of the ones contained within the link above

DPC Latency issues using wired or wireless adapters

I am experiencing terrible audio popping and skips on my HP Desktop when playing iTunes music or watching a video streamed from the internet. I used the DPC Latency Checker and discovered that both the wired LAN adapter and wireless adapter were causing the problem. When I go into Device Manager and disable the drivers for both adapters the problem goes away. When I enable either driver the problem comes back. It's definitely being caused by the network adapter drivers. I've enabled/disabled all the other drivers on my PC and its pointing to the network adapters. But the network adapters are from different manufacturers. Realtek for the wired and Ralink for the wireless. I've updated both drivers and it didn't fix the problem. My only conclusion is both adapters must be connected to the motherboard and something within the mohterboard is causing the problem. If anybody as some feedback it would be greatly apprecaited. I don't want to buy another PC. But I can't seem to solve the problem.

Hello , I have read your post on how your desktop computer is experiencing an audio popping and skipping sound when playing iTunes music or streamed videos, and I would be happy to assist you in this matter! Since you have already re-installed the audio drivers for your computer, I recommend returning your system back to a previous restore point before the issue occurred. This can be done by following the steps in this document on Using Microsoft System Restore (Windows 7).
Should the problem continue, I suggest performing a backup and recovery of your operating system. This can be done by following the steps in this resource on Backing Up Your Files (Windows 7), as well as Performing an HP system recovery (Windows 7). This should return your system back to factory defaults.
If the issue continues, please contact our technical support for further assistance in this matter by clicking the link below to get the support number for your region.
www.hp.com/contacthp/
I hope this helps!
Regards

Serious DPC latency issues with Xbox One Controller

Not sure if this is the right forum for it, but I'm hoping...
I recently got an Xbox One Controller (with a USB cable for Windows), and installed the x64 drivers for them. I've been using it for a while with no problem, however I recently had to reinstall Windows 7 due to an NVidia driver issue. I am now seeing some
issues with certain games, notably Elite Dangerous and Lord of the Rings Online (which doesn't even use a controller) while my Xbox One controller is plugged in. Terrible lag, sound cutting out. I used DPC latency checker and found that it was spiking bad.
Using LatencyMon I found that USBport.sys was the culprit. I unplugged the Xbox One controller and it was gone.
Here's the catch, I know it's not the USB port or an IRQ issue because if I plug in my Thrustmaster T-Flight HOTAS X to the same port, using the same IRQ, etc. I do not experience any issues. This is related ONLY to the Xbox One controller. Why would the
One controller cause this, and is there anything I can do to fix it? I have looked everywhere.
My PC specs are:
Windows 7 x64 Ultimate
Intel i7-2600k OC @ 4.2ghz
16gb DDR3 ram @ 1600mhz
Nvidia GTX 770 OC 4gb
MSI z68a-gd65(g3) motherboard
HT Omega Claro Halo soundcard
Any help would be appreciated, Thanks!
Edit: I actually had to disable HPET in my bios to even run LOTRO or it would crash my PC, that was until I found out it was the One controller that was causing it.

Hi Marcus,
Considering this issue occurred after reinstalling the machine, please ensure your system is update to date.
Since you have caught the culprit with the LatencyMon, have you tried to update the USB controller or reinstall the USB controller to have a check .
Apart from this ,is the One Controller Driver a manufacturer driver ? If it isn`t official driver ,I recommend you to download the driver from the manufacturer website.
Best regards
Hi MeipoXu,
Thanks for the reply. :) I've been scratching my head with this issue.
I've got all updates done and I used the official x64 Xbox One controller driver from Microsoft. Also have tried update, reinstall the USB controllers under device manager, even tried replacing usbport.sys with a friends copy but they were identical.
What's interesting to note is that this doesn't happen in all games, only certain ones. Since I haven't played either of those games I mentioned after I got the One controller and before the reinstall, I have no clue if it had anything to do with the reinstall
or if it's just an issue with the controller. I posted on those games forums and did not get any replies.
I did notice a lower DPC latency when I plugged the controller into my third-party USB 3.0 controller ports, but it was still spiking up into the reds consistently. I also went as far as to unplug ALL other USB devices, including my mouse and keyboard to
see if that made a difference, and it didn't. Nothing else does this, only the One controller. I'm at a loss. =/

P45D3 DPC Latency Issues

I just submitted a Customer Service request.
I see this has been an issue with other MSI P45 MB's. This system is purpose-built for recording, the spikes negatively affect my ability to record at low buffer settings. Otherwise, everything is perfect-very nice MB. Here's hoping they have a custom BIOS to fix this.
MSI P45D3, Intel Q6600, Scythe Zipang SCZP-1000 cooler, 4GB Patriot PVS34G1333LLK, PowerColor HD4650, Thermaltake ToughPower 750, LiteOn 22x SATA DVR-IHAS422-08, WD VelociRaptor 150GB (system drive), Seagate 500GB (data), Seagate 1TB (audio drive), ADS Pyro 1394 card, XP Pro SP3. Rack case. Presonus Firestudio 26x26 & MSR, Presonus Digimax FS, Lucid GENx6-96 Word Clock, and more...

Quote from: Thirteen on 11-February-09, 17:44:24
Is this a beta or a public BIOS?
When did you submit the request? (nothing happened with mine for the P45 Neo3 latency issue yet)
I submitted my issue to customer service (http://ocss.msi.com.tw/) on 9FEB. I received a reply 10FEB. The BIOS file has been on their ftp site since 23DEC08. It is not the public BIOS (1.6) available for download on MSI web site.
There is a BIOS I believe is for for your board with the same file name type as the one I used on the ftp site. Mine was A7513ICI.101. There is an A7514ICI.101 here: ftp://ftp.msi.com.tw/BIOS/7514/. Up to you if you want to chance it.
DL USBoot.rar from here: ftp://ftp.msi.com.tw/Tools/ follow directions to make bootable USB flash drive. I DL AFUWIN from here: http://www.ami.com/support/bios.cfm and found the newest version of AFUDOS.exe in one of the folders and put that on my bootable USB stick. The version MSI provided would not work for me. Change boot order to USB 2.0 first. Once booted on USB stick syntax I used was: afudos /i(BIOS filename) -no parenthesis when entering in DOS - at first it gave me an error but then it quickly proceeded to execute. I'd back up your current BIOS just in case.
Good luck.

DPC Latency issue, need to update BIOS?

I'm into recording music and latency is of great importance. I did a DPC latency check and noticed I was getting some major peaks, constantly. I tried everything, removing sound card, disabling drivers, etc, etc and nothing works. Then I did a google search and found this: https://forum-en.msi.com/index.php?topic=125206.0
I have...
Model name: 7519 v1.0
M/B ERP Version: 06
I have NEVER flashed BIOS before and have no idea how to do it. I don't even have a floppy drive. I really need to fix this latency issue though, otherwise I will have to buy a new computer :(
Can someone help me? I sent en inquiry to the support, but did not get a reply.
Thank you.

Quote from: Jack on 29-March-11, 00:00:44
What is the model name of your mainboard? There are many MS-7519 mainboards with different PCB and ERP numbers (your ERP number is incomplete, there must be three digits):
http://eu.msi.com/service/search/?kw=7519&type=product
The best way to approach this, is to check your current BIOS Version as displayed on the P.O.S.T. Status Screen:
Write down the full BIOS ID String as it appears in the red box in the example picture. When we know the BIOS Version, it is possible to check whether or not there is Latency Fix for your board out there or not.
Have a look here and make yourself familiar with our MSI HQ Forum USB Flashing Tool: >>Use the MSI HQ Forum USB flasher<<.

MSI P45 Neo3 DPC Latency issues

Hi guys. I'm on a MSI P45 Neo3 and so far everything's good. The only thing wrong is the high memory latencies I'm seeing in the DPC latency program + programs sometimes taking too long to load or start up etc.
My motherboard is MSI P45 Neo3 - MS-7514 V1.0
Is there any beta BIOS I can try to fix this problem for my motherboard?

My configuration:
Antec Midi Tower Sonata III Life Style ATX 500W
Arctic Processor cooler F7-PRO
Asus PCI-e Radeon HD3450 256MB Silent DVI/HDCP videocard
Intel Core 2 Duo E8400 3.00GHz 1333 6MB Boxed (C0 I think)
LG DVD-/+/RAM GH20NS10 20x/20x/12x Bulk
Logitech MX518 Optical Mouse (connected via PS/2)
Microsoft Digital Media Pro Keyboard (connected via PS/2)
MSI P45 NEO3-FR iP45 (PCB 1.0)
NEC Floppydrive 1,44MB 3,5"
OCZ 2x2GB DDR2 SDRAM PC6400 CL5.0 Platinum (in dual channel mode)
Samsung 640GB SATA300 16MB, HD642JJ (in RAID "prepared" mode)
Sweex Card Reader CR005V2 All-in-1 Intern 3,5" USB2.0
All running their latest firmware/BIOS and drivers as far as I know.
The system uses default BIOS (v1.6) settings, no overclocking at all.
Where should I start my investigation?
Disable software, drivers, or hardware?
Any suggestions on which particular item?

Satellite U500-1DZ DPC latency problem with the graphic card geforce 310M

Hello
I have a problem with de DPC latency cause by the nvdia card driver.
I use my computer for audio and it's really not possible to work.
graph with geforce abled :
http://nsm04.casimages.com/img/2010/09/22/100922123519210586795529.png
when i disable the graphic card :
http://nsm04.casimages.com/img/2010/09/22/100922123519210586795528.png
Please give me an answer.
My computer is a Toshiba satellite U500-1DZ, intel i5
Thank you

Hi, thank you for your answers.
I have updated the last nvdia driver, the new bios and everything I found on this website, but It doesn't change anything...
Apparently I'm not the only one to have this problem, but I don't know if it comes from Toshiba or from Nvdia.
Do you know if it's normal to have four times "NVDIA High definition Audio" in the audio/video/games controllers ?
When I seactivated it it's a litlle bit less worth (but still not good)...
I'm using a preinstalled windows 7 64 bit version
Thank you !
Fred
Message was edited by: fredo0411

DPC latency

First of all I would like to say hello to HP community.
I have HP CQ71 laptop and experiencing serious DPC latency issue. While running DPC latency checker I receive >20000us latency what causes sound cracks. Tried to turn off ethernet / wifi / modem / other devices, but still no help. I have somehow decreased latency whit disabling Windows sounds, but still sometimes DPC latency peeks at ~20000us. Tried uninstalling antivirus, turning off firewall but still the same.
Please help me solving this issue. Thank you in advance.
My company dell didn't have any of this problems.

Yes, I have this same problem with my:
HP Pavillion DV-6
4GB DDR3 RAM
500 GB - 7200 RPM disk
and have been going around in circles for weeks trying everything the "experts" have suggested with no change at all. In fact, I've disabled EVERY driver and my DPC latency still spikes at over 20,000 microseconds.
In my case, I'm trying to record audio using a Line 6 UX-1 USB sound capture card. Whether or not this is attached, my DPC Latency checks peak at ~20,000. Needless to say, anything approaching this causes the recording to drop. VERY FRUSTRATING when I have spent 20 minutes getting my guitar tuned, warming up, getting just the right feel, then turn on "RECORD" and it works... for about 3 minutes, then the device just drops out... usually just as I'm feeling good about how it's going. Please... no advice about ASIO drivers, USB stuff, etc... With no audio recording software or hardware in play, the latency on this machine is through the roof!
Luckily, I bought this from Costco and can return it for a full refund. I'll try a Dell next and see if the problem follows the manufacturer (HP) or the o/s (Microcrap) . In that way, I'll make my way through all the hardware that Costco sells and report back here in a couple of weeks.

Very High DPC Latency

I've been searching for months, i haven't found a solution. I have a dell 14r, and i've got very high dpc latency, i've disabled Intel speed step, i don't know if it was the cause, but helped a little, but a still have some high DPC.
here's the DPC Conclusion
CONCLUSION
Your system seems to have difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup.
Check for BIOS updates.
LatencyMon has been analyzing your system for 0:00:50 (h:mm:ss) on all processors.
SYSTEM INFORMATION
Computer name: ALEF
OS version: Windows 8 , 6.2, build: 9200 (x64)
Hardware: Inspiron 5437, Dell Inc., 01PN4H
CPU: GenuineIntel Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz
Logical processors: 4
Processor groups: 1
RAM: 6048 MB total
CPU SPEED
Reported CPU speed: 1596,0 MHz
Measured CPU speed: 180,0 MHz (approx.)
Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.
WARNING: the CPU speed that was measured is only a fraction of the CPU speed reported. Your CPUs may be throttled back due to variable speed settings and thermal issues. It is suggested that you run a utility which reports your actual CPU frequency and temperature.
MEASURED INTERRUPT TO USER PROCESS LATENCIES
The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the
signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.
Highest measured interrupt to process latency (µs): 1572,913052
Average measured interrupt to process latency (µs): 22,366048
Highest measured interrupt to DPC latency (µs): 1565,856753
Average measured interrupt to DPC latency (µs): 11,824275
REPORTED ISRs
Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.
Highest ISR routine execution time (µs): 364,749373
Driver with highest ISR routine execution time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Highest reported total ISR routine time (%): 0,106754
Driver with highest ISR total time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Total time spent in ISRs (%) 0,133510
ISR count (execution time <250 µs): 21131
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-999 µs): 3
ISR count (execution time 1000-1999 µs): 0
ISR count (execution time 2000-3999 µs): 0
ISR count (execution time >=4000 µs): 0
REPORTED DPCs
DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.
Highest DPC routine execution time (µs): 747,735589
Driver with highest DPC routine execution time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Highest reported total DPC routine time (%): 0,297310
Driver with highest DPC total execution time: ndis.sys - NDIS (Especificação de Interface de Driver de Rede), Microsoft Corporation
Total time spent in DPCs (%) 0,652473
DPC count (execution time <250 µs): 263660
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 253
DPC count (execution time 1000-1999 µs): 0
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs): 0
REPORTED HARD PAGEFAULTS
Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted
and blocked from execution.
NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.
Process with highest pagefault count: explorer.exe
Total number of hard pagefaults 1115
Hard pagefault count of hardest hit process: 493
Highest hard pagefault resolution time (µs): 12225544,827694
Total time spent in hard pagefaults (%): 247,355044
Number of processes hit: 22
PER CPU DATA
CPU 0 Interrupt cycle time (s): 0,761402
CPU 0 ISR highest execution time (µs): 331,166667
CPU 0 ISR total execution time (s): 0,090588
CPU 0 ISR count: 7756
CPU 0 DPC highest execution time (µs): 678,561404
CPU 0 DPC total execution time (s): 0,432507
CPU 0 DPC count: 129558
CPU 1 Interrupt cycle time (s): 1,093584
CPU 1 ISR highest execution time (µs): 364,749373
CPU 1 ISR total execution time (s): 0,177768
CPU 1 ISR count: 13378
CPU 1 DPC highest execution time (µs): 650,636591
CPU 1 DPC total execution time (s): 0,566066
CPU 1 DPC count: 21399
CPU 2 Interrupt cycle time (s): 1,091097
CPU 2 ISR highest execution time (µs): 0,0
CPU 2 ISR total execution time (s): 0,0
CPU 2 ISR count: 0
CPU 2 DPC highest execution time (µs): 747,735589
CPU 2 DPC total execution time (s): 0,292306
CPU 2 DPC count: 112231
CPU 3 Interrupt cycle time (s): 0,461547
CPU 3 ISR highest execution time (µs): 0,0
CPU 3 ISR total execution time (s): 0,0
CPU 3 ISR count: 0
CPU 3 DPC highest execution time (µs): 338,436090
CPU 3 DPC total execution time (s): 0,020591
CPU 3 DPC count: 725

Hi,
Please refer to the article below:
http://blog.tune-up.com/windows-insights/title-poor-jerky-performance-fixing-unacceptably-high-dpc-latency-issues/
Andy Altmann
TechNet Community Support

HOWTO: Low DPC latencies ( 100 us) on bootcamped Macbooks (Pro)

Here is a small HOWTO for getting the lowest possible DPC latencies (<100 us) on bootcamped Macbooks Pro (late 2008):
Disclaimer: I did all tests on my late 2008 Macbook Pro Unibody 2.8 GHz model with NVidia chipset and graphic. Most of the following suggestions should apply to standard Macbook models and likely older generation as well.
First of all Intel Speedstep can lead to dropouts and higher DPC latencies on small load! Unfortunately all tools that are supposed to manually switch Speedstep off don't seem to run on the late Macbooks (Pro) while on OS X you can use "Coolbook".
Your only way to make sure your processor is clocked high enough and not dynamically switching is to put up a constant load (like running your DAW pretty hot or running Prime95 at "Idle/Lowest" process Priority in the background). I will keep investigating if I can find a tool to switch Speedstep off.
Most importantly (to get rid of really bad DPC latency spikes):
Kill the process "KBDMGR.EXE"!
That's Apple's driver for controlling brightness and keyboard lighting via the function keys and setting tap options for the trackpad. It seems to have broken multithreading!
You can also change the CPU affinity of KBDMGR.EXE to CPU1 (not CPU0!) which will help decreasing DPC Latencies alot, but there will still be Audio dropouts.
Here's a small toolkit I put together that allows you to conviniently enable/disable Apple's "Boot Camp" tray application (KBDMGR.EXE) via an icon link and/or keyboard shortcut. Optionally it will switch the function of the F-Keys automatically for you depending on whether Boot Camp is loaded or not.
Furthermore it automatically turns Boot Camp's CPU priority to "Idle" and CPU affinity to CPU1 in order to turn down the bug induced DPC Latencies and prevent dropouts with Windows sounds and Media Player playback. Professional Audio users will find that only turning off Boot Camp will allow low audio latency usage. Installation instructions are included in the README.TXT for your convinience.
Boot CampED download page
Direct Download:
Boot CampED.zip - 3.3 kb
Turn off the Broadcom 802.11N WLAN driver via Device-Manager or update to the latest drivers via Microsoft Update Catalog.
Like on OS X the Airport module can lead to audio dropouts. The DPC Latencies produced by the Broadcom driver are less regular than the KBDMGR thing, alot higher in value. Best thing is to try for your own needs.
Update:Meanwhile a new Broadcom drivers was published via Microsoft's Update Catalog named "Broadcom - Network - Broadcom 4322AG 802.11a/b/g/draft-n Wi-Fi Adapter " (4322 is the chip used). This one comes with both low DPC latencies and finally the ability to use the full rate upto 300 mbit/s. Go get it! For safety you might still want to turn WLAN off during critical audio work though.
Change the graphic-card driver to "Standard VGA Driver" via Device-Manager or use RIVATUNER to enforce a fixed clock-rate and performance mode.
Update:The dynamic clock-rate switching happening with NVidia drivers in order to save power and keep temperatures low leads to extreme DPC spikes for each switch and constantly high DPC latencies when it settles in low performance 2D mode. RIVATUNER's "Enforce Performance Mode" option can be used to set the card to a fixed clock-rate. I recommend using "Low Power 3D" for audio work.
User of XP might think that they don't need this, but be aware that on XP the NVidia driver keeps running at highest clock-rates in "Performance 3D Mode" all the time. Via RIVATUNER you can switch to "Low Power 3D".
Turn off the ACPI compliant Battery driver via Device-Manager
This driver polls the battery for its current load status and produces a small, single, short spike exactly every 15 seconds. In my own tests I found that it doesn't seem to affect low latency audio performance. Furthermore turning it off will remove monitoring of your current battery status. But if you are running on power-chord anyway and want to make absolutely sure you can turn it off.
All other devices don't add much if anything to DPC latencies, but can savely be turned off if you don't need them (like Nvidia LAN, Bluetooth, Onboard High Definition Audio).
Attention: Removing the Battery while the power chord is connected results in permanently reduced CPU clock (downto the lowest clock setting possible). According to Apple this is done to prevent overloading the power-supply during heavy load as it needs the assistance of the battery from time to time.

I'd like to underline that these are workaround. Now that the Broadcom drivers are fixed it is up to Apple to fix KBDMGR and to get the NVidia drivers fixed!
Furthermore it seems as if only Vista 32-bit and OS X are heavily affected by Intel Speedstep, Vista 64-bit and Windows 7 (32/64) work alot better in this regard. XP is a mixed bag.
Here are some screenshots to prove that the workarounds do help:
DPC Latency before applying the workarounds:
DPC Latency Vista 64-bit (Idle, Speedstep enabled) after applying the workarounds:
DPC Latency Windows 7 64-bit (Idle: Speedstep enabled) after applying the workarounds:
As you can see Vista's DPCs run well below 100 us once everything is optimized, Windows 7 is a bit worse, XP is even better. But practically you get the same results when using all three for professional Audio work.
Message was edited by: T1mur

Extracted Audio Problem

Hello, I'm having a problem with my current project in iMovieHD. I learned through bitter experience that it was a good idea to extract/lock my audio back when I was using iMovie 4. Since using iMovieHD I have continued this practice, even though people tell me the shifting audio problem is no longer an issue. Anyway, today I extracted & locked the audio before I burned the DVD, and I find that the audio has been corrupted. It just makes random popping noises. When I put it in "View Waveform" mode, I can clearly see that the audio is still there. It just won't play now. Any suggestions as to what I can do to fix this problem. I can't go back to unextracting the audio now - too late for that. HELP!

Well, the back and forth using the camera worked - but it was a lot of labor. First I erased the two hundred or so other clips other than the five I wanted to work with. UN-extracted the audio, with the clips still in Slow Motion, and exported to the camera (which functioned, luckily). Quit iMovie, did not save the changes, and opened her back up, and re-imported the clips. Worked like a charm. Just like you said, it tricked iMovie into thinking the slow motion clip was just how the regular clip played. Stupid computer, haha.
Lastly, just to clear it up. I was attempting to slow the clip AND the audio down the same, so, for instance, like when someone yells "Noooooo," it makes the voice deeper and longer. It's funny. But when I would extract the audio from the clip, it would go all Matrix and funky on me. No big deal anymore.
And what the heck are you doing up at 4:45 in the morning? lol. Anyway, thanx for your input and time - I really appreciate it. All seems well. Thanks again, Matt.

DPC latency + audio/mouse skip and stutter on t420s

Hello fellow thinkpad owners,
I have a new t420s (41717FU) core i7, 8GB RAM, and NVS 4200M discrete, win 7 64-bit pro. I use the minidock with 2 external 28" displays on DVI out.
I discovered major issues with latency with this machine; very noticeable loss of control for about half a second, plus annoying audio stutter, especially concurrent with network activity. This is quite frustrating, especially for a machine that is supposed to be high end core i7 with discrete graphics. I had a t410s previously and also had latency problems, and I know this is a real problem with several different models (just search 'annoying audio') on the forums.
I have used dpc latency checker as well as latency mon and narrowed the probable culprit to the network drivers associated with the gigabit ethernet. It took me a while to discover the relationship to the Intel 82579LM, since LatencyMon will identify the problem with NDIS.sys or NETIO.sys, giving sporadic latencies over 20000 microsecs, which made me think it was a Win 7 tcp stack issue or maybe some internal windows firewall blocking. During these spikes, the audio stutters, the mouse won't move, everything on the system just stalls for a split second. Temps on CPU seem within normal limits at about 70-80C. I've read everything I could find about this issue, including problems with NVIDIA drivers, ACPI, firewall/antivirus, etc etc, and tried most of those suggestions.
I spent a long time doing all kinds of testing, putting the machine on AC power and max performance, shut down various devices, disabled any component power-off states, disabled NVIDIA and displays, changed bios settings etc.
After all of this, I *know* my issue is related to the Intel Ethernet component, because if I disable it and use wireless connectivity (or no network at all) the problem simply goes away. Surprisingly, the wireless Centrino adapter, though slower, functions without any problem affecting DPC latency and I have no stutter with that (many have previously identified the wireless adapter being a problem especially related to power mgt).
Unfortunately, I require an ethernet connection. So just disabling that adapter is not an option. Here is what I've done to workaround the issue, though I wish it would be fixed for good with some kind of update from Lenovo, though I've called and emailed them and they seem to be ignoring this issue.
**** UPDATE 3/1/2012 ****
SOLUTION RIGHT HERE: INSTALL AN OLDER NETWORK DRIVER FROM HP (sounds crazy, but it works). See below link to driver download.
I (and many other owners of T420, 520, etc - see other posts if you doubt it) have *no* latency after installing this older driver from HP. But as soon as I install the Lenovo-provided driver 11.12.38.* or any later one from Microsoft or the Intel generic driver (intel no longer publishes the old driver), I see *immediate* problems with latency, mouse and audio stutter. But use the driver published by HP (specifically version 11.12.36.0, published 5/4/2011) -- Problem solved! I tested with streaming and browsing for several hours and no spiking or stutter.
Here's where to get the english language download from HP: >> DRIVER DOWNLOAD PAGE HERE <<
Lenovo, PLEASE: this is strong evidence of a faulty driver for those of us with a t420s (and other thinkpad users out there using the intel 82579LM chip under x64). I encourage you to review this solution and engineer an update for the Intel gigabit adapter, or at minimum, roll back to the older driver or some Lenovo approved derivative so it doesn't cause all of us notebook users such a major headache. It's very bizarre that we would need to go to another manufacturer to get a working driver...I was ready to return the machine over this issue!
Aside from that adapter problem, I've been pleased with the t420s performance and features. Thanks again lopiuh for this workaround.
Mojojojo in Austin TX
ADMIN EDIT - Lenovo is testing a beta ethernet driver. If you are willing to try it, please see the link below, and my post on page 6 of this thread. - mark
https://www.dropbox.com/s/llcgjaf45xpuoam/83rw20w1.zip
***** END UPDATE *****
**** OLDER STUFF I TRIED, which somewhat helped, but the real solution is to use the old HP DRIVER above. ******
Basically, my approach was to reduce the 'auto' parameters for the adapter, to reduce the amount of logic running on the adapter itself.
1. Install the PRO set extension tools on this adapter, so you can more easily manage advanced settings. I think Lenovo offers a version in the driver downloads area which adds this management extension, but it is not the standard one offered by the system update utility, and the intel site has a later driver, so I gambled and downloaded the latest version from Intel for this adapter. It installed without issue, but I'm sure Lenovo would prefer you stick with their OEM packages. Anyway, here's the one I used: http://www.intel.com/support/ethernetcomponents/controllers/82579/sb/CS-032239.htm (link near the top for the download). You may want to make a system restore point before you install any drivers outside of OEM approved.
2. Change the default settings for the adapter in Device Manager. Right click properties for the Intel 82579LM in Network Adapters. Change the link speed (if the extension was installed properly, you'll see the intel logo on the tab for Link Speed, and a choice for Speed and Duplex. Change this from 'Auto Negotiate' to whatever speed your network is. I have gigabit full duplex, and that worked for me. This by itself was the biggest improvement with DPC latency.
3. Go to the Advanced tab. I took the approach that I wanted to disable as much 'auto' stuff as possible, and force the adapter to use a particular setting. Thus:
Interrupt Moderation: Disabled
Jumbo Packet: 9014 bytes (I have several devices that can use bigger packets on network, such as readynas)
Performance Options: click properties: Flow control - Disabled; Interrupt Moderation Rate - Off; and then double the receive and transmit buffer sizes (for me this was 512 and 1024 respectively).
I hope this may be helpful to some other owners, but I don't work for Lenovo or Intel so please don't blame me if something goes wrong during your tweaking. This worked (for me) to significantly reduce stuttering problems, though they are not completely gone; your mileage may vary. If you have this same problem, I'd appreciate if you would post about it so I can understand if it is a more widespread problem.
Good luck, mojojojo
Austin, TX
Solved!
Go to Solution.

Hi mojojoj0
For my W520, up till now I do not have latency issues. My set of configuration for Intel NIC is slight different.
2. This may cause connection problems when you are connecting to different network. Different network (switches, routers) have different configuration. Previously I set it to Gigabit Full Duplex, I can't connect to any 10/100 network until I change it back to Auto negotiation.
I would suggest changing back to auto negotiation when you are connecting to outside network, not all places are using gigabit switches.
3. Interesting, I guess I would try it and feedback and see how much improvement for network performance.
From what I know, increasing receive and transmit buffer improve NIC and network card performance, but computer may slightly more memory.
Maybe you can try this, part of my settings:
Large Send Offload (IPv4) & (IPv6) Enabled
TCP & UDP Checksum Offload (IPv4) & (IPv6) Tx & Rx Enabled
IPv4 Checksum Offload Tx & Rx Enabled
Hope this helps!
Cheers
Peter
(Current: W520 4284-A99) (Refunded: W510 4876-A11)
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Mark it as solved if the solution works for you, so it could be reference for others in the future
Dolby Home Theater v4 (ThinkMix V2)!
http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W520-Sound-Enhancement-Thread/m-p/451401#M155...

DPC Latency problem

Hi everyone ;)
I'm trying to fix my pc. I'm experiencing DPC Latency problem and it causes audio stuttering. I'm running Windows 8.1 x64. When I'm running LatencyMon, it shows me that some of my drivers give a really high latency.
I was trying to install new drivers, turn off my soundcard (Sound blaster Audigy SE). The problem started to occur, just after a clean install of Windows 8.1, two days ago. Earlier I did not have any problems
with DPC latency. The weird thing is, that I do not have any audio problems when playing games. The problems occur when I'm listening to music or watching movies. Thanks for your help and sorry for my bad english.
PS My computer specs:
Gigabyte GA-G41M-Combo (rev. 1.3)
4 GB DDR3 RAM
Nvidia GeForce 450GTS
Intel Core2Quad 2.5GHz
Creative Sound Blaster Audigy SE
Wireless mouse and keyboard (microsoft ones)
Drivers causing DPC Latency:
ntoskrnl.exe
USBport.sys
dxgkrnl.sys
nvlddmkm.sys
ataport.sys
CLASSPNP.sys
rspLLL64.sys
Thank you for your help!

Hi,
First, please let me know what player you use to listen to music or watch movies? I considered the codec conflict.
If there is any third part player installed, please remove it to check the issue.
If the issue still persists, please upload the .etl file here for further research.
Keep post.
Kate Li
TechNet Community Support

S20 Audio Stutter / DPC Latency...can't fix it. Need help!

Hi everyone,
I recently (last week) bought a Lenovo S20 (Xeon W3520 with memory upgrade to 6GB). I mainly
use this workstation as a DAW for audio recording / editing. Instead of the preinstalled Windows XP (32bit)
and the Vista Business that comes with the DAW, I installed Windows 7. Everything went fine,
system is stable, ThinkVantage drivers are up to date. A NVIDIA GeForce 260 is used as graphic card.
But for audio applications my S20 as it is right now, is simply unusable. I get drop outs/stutter even with the on board sound, if I play back a mp3 or wav file. I deactived unnessary devices / background programs, tested it with HT on/off, tested it without Speedstepping and without Turbo Mode. No difference. I get a regular DPC spike every 15 seconds. And the spikes are really high (16ms). No difference if I plug in an EMU 1820 PCI card instead of the on board sound. Disabling the on board LAN didn't make a difference either.
Take a look: DPC Latency Screenshot
Any idea how to solve this?
Best,
dynamitec
Solved!
Go to Solution.

Hi erik,
thanks for your reply!
It's not that only Pro-Audio doesn't work on my machine. If I simply recover the Vista Business DVDs and try to play a Wav-File or Mp3 with Windows MediaPlayer I get dropouts every 15-16s - without anything else installed. Also websites for example hang if this spike occour. In my opinion this is a serious fault in my system (not to mention that I bought the workstation for Pro-Audio usage, which I simply can't do as it is right now).
I first thought that it's maybe related to the hardware I build in (Graphic Card, SoundCard), but since it happens without any graphic card / additional soundcard installed it has to be a problem with the basis configuration.
I'm calling Lenovo support tomorrow. I really need a replacement, since the workstation is outperformed by my old Q6600 system without any problems. And I'm really feeling like I wasted a lot of money for nothing
Best,
Benjamin

VLC audio problems on T400 - DPC Latency Issue?

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