Windows 8 and 8.1 Forums


DPC latency spikes from USBPORT.sys

  1. #1


    Posts : 6
    Windows 8

    DPC latency spikes from USBPORT.sys


    Hey everyone,

    I'm yet another victim of DPC spikes caused by USBPORT.sys. I definitely know there are lots of other threads regarding this problem, but so far none of them have helped.

    I tried most of other tweaks suggested, from power management settings, to disabling stuff in the device manager, etc... but nothing so far. I even restored my pc to factory setting yesterday, but still nothing. Tried both on W8 and W8.1. I'm on a laptop by the way.

    I would very much appreciate if you could have a look at my .etl file hoping you can see something I don't see from it. I've also added the .txt file since the .etl is quite big.

    https://drive.google.com/file/d/0B15...it?usp=sharing
    https://docs.google.com/document/d/1...it?usp=sharing

    Thank you very much for your time!

      My System SpecsSystem Spec

  2. #2


    Posts : 1,883
    7601.18247.x86fre.win7sp1


    So how does video and audio work on the machine? Well, without skipping, pops, crackles - good framerate and not choppy?
      My System SpecsSystem Spec

  3. #3


    Posts : 6
    Windows 8


    When I play audio or video it works just fine. The problem arises when I use my Digital Audio Workstation. The cracks/pops are frequent, and often, after 10 minutes or so, it dropouts.
      My System SpecsSystem Spec

  4. #4


    I have a (home) recording studio using Sonar X3 and a Roland Octa-Capture. Are you looking at the DPC Latency Checker? or the Respledence? The DPC Latency Checker is invalid for Windows 8 and will show spikes that are not there.

    On my Windows 7 system, I do not have any latency problems (either system or audio) and the DPC Latency Checker (which is valid for Windows 7) shows a very good system, however, the Resplendence program shows many problems, that obviously are either not there or of no consequence.
      My System SpecsSystem Spec

  5. #5


    Posts : 6
    Windows 8


    I used both LatencyMon and xperf which gave me similar results. I tried DPC Latency Checker as well out of curiosity (since they say it doesn't work well on windows 8) and it shows a much worse situation (constant 1ms DPC latency at least, with occasional 5ms spikes).
      My System SpecsSystem Spec

  6. #6


    You don't show any "My System Specs". Some PC spec's would help us to try and help you.

    BTW, I have Sonar X3 installed on my Win 8.1 system and the same there, no issues.
      My System SpecsSystem Spec

  7. #7


    Posts : 1,883
    7601.18247.x86fre.win7sp1


    Quote Originally Posted by CaptainTuna View Post
    When I play audio or video it works just fine. The problem arises when I use my Digital Audio Workstation. The cracks/pops are frequent, and often, after 10 minutes or so, it dropouts.
    If it is firewire-based, you can fix it by using the legacy driver from Windows 7 for IEEE 1394. You have to manually extract it and stuff then import to 8.

    I've developed and tested the method many years ago for 7, and 8 still needs it for most pro quality firewire solutions.

    MOTU now offers that as their standard advice, based on my findings.
      My System SpecsSystem Spec

  8. #8


    Posts : 6
    Windows 8


    Quote Originally Posted by fireberd View Post
    You don't show any "My System Specs". Some PC spec's would help us to try and help you.

    BTW, I have Sonar X3 installed on my Win 8.1 system and the same there, no issues.
    Oops, you're right. Just added them now! Apart from the ones I mentioned in the specs, the laptop also comes with a card reader and bluetooth module. I got my bluetooth module disabled, but I'm not really sure on how to disable the card reader (can't find anything in device manager).

    Quote Originally Posted by MasterChief View Post
    If it is firewire-based, you can fix it by using the legacy driver from Windows 7 for IEEE 1394. You have to manually extract it and stuff then import to 8.
    Unfortunately it's not . Im using an external USB sounds card, but the high latency also occurs when it is not plugged in.
      My System SpecsSystem Spec

  9. #9


    In addition to the Legacy mode, for many, most audio devices that use Firewire use either the DICE or DICE II Firewire chipset in the device. The DICE/DICE II want to see a T.I. chipset at the PC end for proper operation.

    I used to have a Focusrite Saffire Pro 40, Firewire recording interface unit. When I first installed Windows 7 and installed the Saffire Pro 40, I forgot to set the Legacy mode for the Firewire. It worked fine for several months then I started having problems and realized I did not set the port for Legacy. Setting the port to Legacy fixed the problems.
      My System SpecsSystem Spec

  10. #10


    I doubt that the card reader is causing any problems. You could disable it in the Device Manager, though.

    Wi-Fi will cause DPC latency and even dropouts in Sonar. Disable the Wi-Fi and see what happens.
      My System SpecsSystem Spec

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DPC latency spikes from USBPORT.sys
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