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Audio Glitches

Mirality

New member
Joined
Dec 15, 2013
Posts
4
A few days ago, my audio was fine. A little later, I noticed that trying to play video (whether through YouTube or local files through VLC or another player) would result in stuttering at points. (Each stutter is brief but clearly audible.) I've even heard the Windows Startup sound stutter occasionally in the same manner.

When running a continuous playlist of files in VLC, the stuttering seems to be fairly random -- many will play through without apparent errors, while others will have several. When playing a single video file, I've noticed that if I stop and then play from the beginning again the stutter will occur in exactly the same spot each time. If I pause, rewind, and play past that point again, it does not stutter; but if I stop and play again it's back.

In between the time when things were working fine and the time that things were not, two things changed that I am aware of (but possibly other things that I am not):

1. I removed my old RAM and installed new RAM. I think I have eliminated this as a direct cause because I tried reinstalling the old RAM by itself and the problem still persists.

2. I allowed Windows Updates to install. However I tried doing a System Restore to a time before the updates were installed and it did not resolve the problem. (I then restored forwards again.)

DPCLAT is showing red bars when I hear a stutter (there's usually one red bar, one green bar, one red bar, and then I hear the stutter).

LatencyMon appears to be pointing the finger at my graphics drivers. I have confirmed that if I set VLC to play audio only then the stutter does not occur, and if I play an affected video while the driver is not installed then the stutter does not occur. However this might be coincidental, and I have not verified with DPCLAT or LatencyMon. I have tried reinstalling an older version of the driver that I know I had running without issues and it does not resolve the problem.

I've attached the stats info from LatencyMon, in case that helps.
 

Attachments

]Hello,

Could you please run Windows SDK setup and select to install "Windows Performance Toolkit"? Once it's installed run the following command from elevated (Run As Administrator) command prompt (if the command asks you to modify the registry, please do that, reboot your computer and re-run the command):

Code:
xperf -on PROC_THREAD+LOADER+PROFILE+INTERRUPT+DPC+DRIVERS -stackwalk Profile -BufferSize 1024 -MinBuffers 256 -MaxBuffers 256 -MaxFile 256 -FileMode Circular

Now, play something in Youtube and VLC, until you experience the issues you mentioned. Once you do, run the following command to stop the logging:

Code:
xperf -stop -d C:\CPU.etl

Attach the C:\CPU.etl log file here.

In addition, please also download and run Sysnative jcgriff2 BSOD File Collection app, attaching its log here. We need this to have more information about your system.

Thanks
 
I've attached the log file. I've tried several times to attach the ETL file but the forum won't let me, even if I zip it first. (If I don't zip it, it says "file too large"; if I do, then it just says "upload failed". It's 55MB unzipped and 8MB zipped.)

I don't know if this is relevant, or whether it started at the same time or earlier, but when I was trying to find causes for the audio glitches I noticed that my CPU multiplier had dropped down to 12 and was staying locked there even under load. (I have an i7 920, so it's supposed to run at 12 when idle and 20-22 when at full load; but for some unknown reason it's just not speeding up by itself.) By disabling some BIOS settings I can get it to run at 20 constantly, and the audio glitches are still present in that case. But whatever is in charge of speeding it up under load does not seem to be working either. (I don't have Linux or an alternate OS installed so I can't check whether this is a problem with Windows only.)
 

Attachments

Still no luck uploading the ETL file. But I've just booted into a Linux live CD and run a few tests that confirm both the audio glitching and the CPU multiplier problems aren't happening on that. So whatever is going wrong there, it looks like it's something in the Windows software/drivers, and the hardware is all good.

I'm not looking forward to it, but I'm wondering if a complete reformat/reinstall of Windows will be the only way out.
 
Now I'm really confused. Just did a clean install of Win7 onto a spare HD and it appears to have the same problem with the CPU multiplier (even when running Prime95, it won't speed up). (Haven't installed any extra drivers yet beyond what came with Windows though.) And yet it was running fine when I tried Linux.

This one isn't completely fatal (unlike the audio glitches) as I can just set the BIOS to run at full speed all the time. But I'd prefer not to, and I don't see why this would start happening now and why it would only affect Windows.

(Haven't checked for audio glitches on the clean install because I haven't yet reconnected the drives where I keep my media files.)

Edit: ok, you should be able to find the ETL file at http://www.mirality.co.nz/random/CPU.zip
 

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