High DPC latency causing audio stutters

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  1. Posts : 913
    CP/M
       #21

    Maybe it is time to start from scratch. What you can do:

    - remove all unnecessary hardware including graphics card
    - reset bios/uefi settings to default
    - install some linux distro (or boot from live medium) and test sound
    - install clean windows, retain generic hd audio controller driver and test sound

    If this bare system works ok, you can one-by-one add hardware & install device-specific drivers and software; test the sound quality after each step.
      My Computer


  2. Posts : 2,585
    Win 11
       #22

    muchomurka said:
    Maybe it is time to start from scratch. What you can do:



    - remove all unnecessary hardware including graphics card
    - reset bios/uefi settings to default
    - install some linux distro (or boot from live medium) and test sound
    - install clean windows, retain generic hd audio controller driver and test sound

    If this bare system works ok, you can one-by-one add hardware & install device-specific drivers and software; test the sound quality after each step.
    I suggested that, except for Linux and that won't fix a windows problem, early on and he claims he's done that.
      My Computers


  3. Posts : 9
    Windows 10
    Thread Starter
       #23

    So I've done everything everyone has recommended and nothing has changed, can anyone read one of my reports to show me what it is?
      My Computer


  4. Posts : 42,992
    Win 10 Pro (22H2) (2nd PC is 22H2)
       #24

    Appreciate your frustration - have you tried pm'ing user Zinou as I suggested way back- zinou is familiar with these reports.

    And what happened when you tried a live boot disk? - I mentioned Kyhi's - which is now harder to download. People have had some success using Free Download Manager.
      My Computers


  5. Posts : 1,938
    Windows 7 Home Premium x64
       #25
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  6. Posts : 9
    Windows 10
    Thread Starter
       #26

    After a month or more, and trying everyone's recommendations and having zinou help me out with many painful traces and long waits, (As suggested) we couldn't come to any sort of solution.

    So I bought a new motherboard, upgrading from a z370 to a z390 chipset board has gotten rid of all latency (that I can hear anyway)

    Also my old mobo was 90 pounds, my new one is 270, so a big upgrade. anyway, case closed now!
      My Computer


  7. Posts : 1
    Windows 10
       #27

    I'm new to this forum but have had the same problem with my year old Dell Inspiron laptop. I'm obviously far less knowledgeable than most of the posters here - I'm simply sharing this because hopefully this can help people who have had the same issue.

    This has been an absolutely nightmare to troubleshoot, as scouring the internet there (1) appears to be a number of different causes for these latency issues involving storport.sys and (2) a number of the solutions seem so impressively random. I saw one person resolve this by rolling back the Intel RST driver, another by taking their PC outside and blowing some dust out, and another that seemed to fix things by simply going into (and not changing anything) in the BIOS.

    For me, the latency issues also appeared frustratingly random. Out of nowhere, the computer would be almost unusable, I would try a million different things, and then 'voila!' something I did seemed to solve it.

    After about seven months of painful trial and error, I think I've stumbled on an answer. The biggest hint was when I took my laptop to the Dell Service Center after a week of paralyzing latency, and of course because of Murphy's law it magically worked fine when I opened up the computer and the service rep took a look. This is what I've found works, for me at least. It's easy enough that I'd say it's worth a shot for anyone else struggling with this:

    1. Fully shut down the computer, plugged in
    2. Unplug the computer. Wait ~30 minutes
    3. Plug the computer back in and turn it on.

    Why this works, I have no clue. But it's worked twice for my machine when the DPC latency issues have started to resurface, and also helped a friend of mine who also has a Dell laptop that was having the same problems.

    I doubt it's a universal solution, but for anyone reading this it might be something to try.
      My Computer


  8. Posts : 4
    Win10, Win7, XP emulated
       #28

    Try changing the affinity of Audiosrv and AudioEndPointBuilder


    Hi Thread,
    Newbie here but not newbie with computers.
    I too have been frustrated by this problem, sometimes there's a burst for a few seconds, sometimes it behaves for some time. It's almost like it can read your mind! You're listening to Brahms Violin Sonata no.1 and you're thinking my word, this is beautiful and what I don't need right now is a stutter...

    The windows audio troubleshooter is useless, its suggestion are useless.
    Done the delete drivers thing and re-install.

    I've even see the problem go away with a windows update early 2021... to then come back in a few weeks with another!!!!
    I haven't dared try the BCDEDIT /SET DISABLEDYNAMICTICK YES and other tricks. It reminds me when I was a school kid and we were playing games on our BBC B's (I'm showing my age) - poke to $FE45 and it makes your game more responsive! - no, it just messes around with the interrupts so you get more keyboard interrupts. Poke the wrong value and your machine was stuffed and became unresponsive, forever dealing with interrupts...

    One thing I can suggest - find the Audiosrv and AudioEndPointBuilder services (start taskmon as admin, go to services, look at description, right click go to details).

    Then on a multi-core system, change the "Affinity" (what cores your process runs on to something other than 0 and 1).

    You will find that most of the time the horrible services ACPI.sys and wdf01000.sys run on cores 0 and 1...


    May I just add, how does a simple battery monitor ACPI.sys end up using some 0.2seconds of processor time!!!! even when you're not on battery power and got the settings on high? These modern processors are capable of BILLIONS of operations per second, so what's it doing? Sloppy coding to me. As to what the hey wd01000.sys is, it doesn't even have its own process but is hidden away in some scvhost.exe (there are tools that can tell you what that exe is running).

    If you have no joy, try getting those scvhost.exe to not run on all the cores.

    If you want to have this done automatically, there is something better than taskmanager. I can't remember it, it remembers how you set the priority and affinity of your processes, so when you reboot, everything is just fine.

    Best of luck.

    I have to say that under the hood, windows is a mess if it can't allow real-time performance on some processes or interrupts that guarantee to complete their slot without abuse.

    An interrupt that goes on for nearly a second isn't an "interrupt", it's an "imposition".
      My Computer


 

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