Windows 8 and 8.1 Forums


High DPC Latency issues when playing games.

  1. #1


    Posts : 6
    Windows 8.1

    High DPC Latency issues when playing games.


    Hello all,

    I'll try to make a somewhat long story short. A couple of days ago I found my computer running unusually slowly when gaming. My computer isn't a powerhouse, but it's run just fine with certain games like GTA5 and Civ 5 if the graphics options have been tweaked appropriately.

    My sound started dropping out, sounding static-like. Tried checking the headphone jack and speakers, which turned out to be fine on their own. As I was playing, the framerate would drop out with the noise seemingly trying to catch up as well. After trying a number of regular things such as turning off programs that suck up CPU usage and memory, it still didn't help. Opened up my laptop and cleaned it out with an aircan, thinking it might be due to dust. Still, no dice.

    I read somewhere that it could be due to high dpc latency, so I downloaded LatencyMon and a dpc latency checker. After letting them run for a number of times along with Windows xperf, it seems as though ndis.sys was the issue. I downloaded SlimDrivers to check on driver updates and it found that my network adapter (Qualcomm Atheros ar9485wb-eg) needed a new driver. Downloaded that, installed it, and still dpc latency was high. Tried disabling it via Device Manager and playing a game, still no dice. Found another possible driver causing the issue, hdaudbus.sys, causing high latency. Can't find a fix for this or ndis.sys through other posts and tutorials. Even tried going from Windows 10 to Windows 8.1 to see if the drivers would work better on the OS type, but it made no difference.

    Here's my specs:

    • Intel Core I7-4500U CPU @ 1.80GHz 2.40 GHz
    • 8 G RAM
    • nVidia GT 745m
    • Qualcomm Atheros AR9485WB-EG


    I'm not one to usually post on forums about computer issues, as I can usually solve them on my own, but this latency issue has stumped me.

      My System SpecsSystem Spec

  2. #2


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    You have a pretty powerful computer. The biggest problems with games is that they are GPU intense and the GPU card needs the horsepower and a lot of RAM to handle them.
      My System SpecsSystem Spec

  3. #3


    Posts : 6
    Windows 8.1


    I get that, but they worked fine on my computer before for the past year until this DPC latency issue occurred this past week.
      My System SpecsSystem Spec

  4. #4


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    Have you updated audio drivers recently? Try rolling them back if so, see if it makes a difference.
      My System SpecsSystem Spec

  5. #5


    Posts : 6
    Windows 8.1


    Okay I'll try that. I've updated them just earlier today, but I'll try scaling them back to see if it makes a difference.

    Side note: After looking at LatencyMon while playing a game, it looks like a combination of ndis.sys and nvlddmkm.sys. Maybe I'll try going back to a previous GeForce driver to see if that works as well. I disabled my network adapter while playing, and it helps somewhat, but it's almost negligible and is a temporary "fix." Nvlddmkm.sys still causes audio stuttering and buzzing while making a hit on the performance too.
      My System SpecsSystem Spec

  6. #6


    Posts : 6
    Windows 8.1


    Updated to a previous driver for my audio (Realtek High Definition Audio) and still no luck. Currently getting an older driver for my GPU.

    The sound works just fine as before with normal browsing, watching videos on YouTube, or listening to music. It's only when it comes to gaming. I don't think it's been an audio issue per se.

    For example, sound and framerate is fine when I start playing a game. About 2-3 minutes in, audio starts to get buzzy and framerate starts to suffer. If I alt-tab out of the game, wait a couple of seconds and go back in, it's fine. About 30 seconds later, it gets choppy again.

    I also can rule out it being a not-good-enough GPU. Before the latency issue, Borderlands The Pre-Sequel worked like butter at 60 frames per second. Now with this latency issue, it starts at 60, then stutters to about 3 frames per second, back to 60, then back to 3.
      My System SpecsSystem Spec

  7. #7


    Central IL
    Posts : 3,468
    Linux Mint 17.2


    It is also possible that an update was installed for the game, which can also change things. Same thing with an update for Windows, Since Microsoft cannot leave certain things alone.
      My System SpecsSystem Spec

  8. #8


    Posts : 6
    Windows 8.1


    It isn't about just one game, it about all of them. I have too many to count and I run through this issue with every game I have.
      My System SpecsSystem Spec

  9. #9


    Posts : 3
    Windows 10

    Help Me!


    I've been facing this exact problem for the past 6 months, haven't been able to get to a solution. I also tried rolling back to Windows 8,8.1, still the same problem. The thing that irritates me the most is that I've played some heavy duty games on my laptop since a year and a half and those same games are now giving me a lousy lag. I also used LatencyMon and found out that the issue could be dxgkrnl.sys or hdaudiobus.sys.
    I've tried disabling, uninstalling and installing almost every version of every driver and still haven't been able to get past this issue. I've tried enabling/disabling all Anti-Virus software, Windows Defender and still faced the same problem. Any help or suggestion would be greatly appreciated!

    System Specs:
    Manufacturer: Sony Corporation
    Model Name: SVF14214CXW
    OS: Windows 10 Home.
    Type: 64-bit
    Processor Type: Intel® Core™ i5-3337U CPU@ 1.80GHz
    Processor Cache 3MB

    Display :
    Resolution: 1600 x 900
    Memory Installed: Memory 6GB (2GB + 4GB)
    Graphics Processor: Intel® HD Graphics 4000
      My System SpecsSystem Spec

  10. #10


    Posts : 6
    Windows 8.1


    Arush Rao, have you checked the fan in your laptop when it's running? When I posted my issue with no one able to solve my problem, I figured all of the steps I took couldn't be a driver issue - did all I could inside and out. After opening up my laptop and trying to run a game, I found that the fan wasn't even running at all. The fan caused the laptop to overheat, which caused the audio to get buzzy and the framerate to drop tremendously.

    Try checking to see if your fan is not working. If it isn't, very gently push the fan in the direction it should be going.

    Not sure if it'll help you, but that's what the solution was to my problem back when I first posted this thread.
      My System SpecsSystem Spec

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