Audio and Video Tearing - High DPC Latency in LatencyMon


  1. Posts : 2
    1904
       #1

    Audio and Video Tearing - High DPC Latency in LatencyMon


    I'm having some audio and video issues. They're most prevalent while playing games (Warhammer 2 and ESO, mainly) and the issues cause the games to stutter, drop FPS, and the audio becomes corrupted. This also occurs when starting the PC. The audio is corrupted and the mouse cursor jumps a bit.

    I'm not sure what I need to post for you to investigate these issues, but let me know and I'll do it.

    I noticed, however, dxgkrnl.sys and storport.sys have extraordinarily high DPC latency in LatencyMon.

    This is what I've done so far to fix these issues:

    * sfc/scannow
    * healthcheck
    * updated my audio driver
    * used DDU in safemode and updated my GPU driver
    * updated my chipset
    * reset my pc

    The following is what I see in LatencyMon. The spikes happen randomly and result in the torn audio and video issues.

    Audio and Video Tearing - High DPC Latency in LatencyMon-2020-07-12.png

    I'm lost and I have no idea what to do now. Thanks in advance.

    Windows 1904
      My Computer


  2. Posts : 35,522
    Win 10 Pro (21H2) (2nd PC is 21H2)
       #2

    Hi, if you search tenforums for Latencymon, for example, you will find other threads which might suggest a way forward.

    Diagnosing this problem is not straightforward.

    One approach is to simplify hardware as much as possible, another to use a somewhat daunting tool from MS, the Windows Performance Recorder (tutorial available).
    Audio and Video Tearing - High DPC Latency in LatencyMon-1.png

    Similarly if you search tenforums for references to this you will see some example screenshots.

    More:
    Solving DPC Latency Issues | Sweetwater
    YouTube
    Resplendence Software - LatencyMon: real-time audio suitability checker


    Older:
    How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8) | Sysnative Forums

    History: (so often omitted by posters):
    - when did you last not have this problem?
    - what has changed since then?
    - change of hardware... feature update (upgrade).. other updates...

    Windows build: 1904 is not a valid major build. Please choose from
    1903, 1909, 2004
      My Computers


  3. Posts : 2
    1904
    Thread Starter
       #3

    Dalchina, thanks, I'm getting started on the Windows Performance Recorder right now.

    Also, my Windows build is 2004.
      My Computer


  4. Posts : 35,522
    Win 10 Pro (21H2) (2nd PC is 21H2)
       #4

    Ok, noted you refer to having updated drivers. It's more often the case that an older driver is necessary - whichever one it proves to be.

    You can, for example, disable your NIC and graphics drivers for test purposes to see if that has any effect - e.g. using Autoruns from MS. A gross process of elimination could give clues.

    Think back to when this started- when might there have been a significant change? E.g. when upgrading to 2004?
      My Computers


 

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