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DPC Latency causing audio distortion and lags.

Dell / Inspirion 7737
July 13, 2017 at 08:37:42
Specs: Windows, Intel i7 4500U
So, I have been searching all over the internet regarding this DPC Latency Issue for like a week. I have tried almost everything over the internet such as.

- Updating network card drivers.
- Updating network card and Realtek sound drivers.
- Installing Windows 8.1 on a separate HDD for a test run.
- Completely removing the Wifi chip and using external wifi adapter.
- Lowering audio bit rate from sound settings.
- Running laptop on integrated gfx and removing/disabling Nvidia GPU.
- And of course what LatencyMon says.

All of this and the problem still persist. LatencyMon says it's ndis.sys and HDAudbus.sys that are causing it but when I disable the internal wifi chip and use my external USB wifi adapter that culprit changes causing the same issue, this time it is nvlddmkm.sys or wdf01000.sys.

So far I have found that the following drivers are the culprit.

- wdf01000.sys
- nvlddmkm.sys
- ndis.sys
- HDAudbus.sys

It has been a week now I am trying to solve the issue but I have made no progress. It is driving me nutts, I am unable to play games because it would suddenly happen and cause everything to lag terribly, make sound distortion/crackling.

Here are the LatencyMon Screenshots.

This is LatencyMon stats: or!

This is my directX information.

Why be born again when you can just grow up?

See More: DPC Latency causing audio distortion and lags.

July 13, 2017 at 12:06:18
While you are waiting for focussed help run these three freebies in the order given and check for malware (they often find what antivirus programs miss):

(blue "Download Now" button on right).
Download and "Save" the file somewhere. Go to the saved file then double click it to run the program. Use the "Scan" button, followed by the "Clean" button.

Junkware Removal Tool (JRT)
(blue Download button).
Download and "Save" the file somewhere. Go to the saved file then double click it to run JRT. It might appear to have stopped at times or flash the screen but sit tight until it has finished.

(use the "Free Download" button rather than the "Buy Now" button).
After the install go to "Settings > Protection". Under Scan Options move the "Scan for rootkits" slider over to On and Run the Threat Scan. Quarantine anything it finds.

If anything is found please copy/paste the associated logs on here. If you lose the ADW log you can find it as a text file in the ADWCleaner folder directly off the system drive root (usually C).

Always pop back and let us know the outcome - thanks

message edited by Derek

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July 13, 2017 at 13:29:34
This cannot be a virus or malware issue as it happens even in a fresh installed copy of windows but thanks for the reply.

Why be born again when you can just grow up?

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