High DPC Latency - UNKNOWN appears in driver report

[deleted03202021]

Hi everyone, I find this forum when searching for cures for my DPC latency issues and came across this great tutorial:

https://www.sysnative.com/forums/wi...y-issues-wpa-windows-windows-vista-7-8-a.html

I've been experiencing some annoying audio dropouts when playing back through WMP, Chrome etc. Here is my DPCLC report:



I followed the tutorial above and produced a Windows Performance Analysis report, there seems to be one driver in particular with a much higher duration than others but under the module tab its just listed as 'Unknown':



Therefore I'm not sure how to solve my issue as I can't identify what's causing my DPC spikes or even if this Unknown one is solely responsible. Any help would be greatly appreciated, my system spec is:

Windows 7 64-bit PRO
Gigabyte EX58-UD5
Intel 920 D0
OCZ 12GB
OCZ Vertex 4 256GB SSD
Enermax Modu 87 PSU
AMD HD6670 GPU

 

[satrow]

Hi and Welcome to Sysnative willsium!

'Unknown' makes me think the driver isn't verified and could be corrupt or otherwise 'interfered' with, possibly by malware or a different, bad, driver. Does LatencyMon show this driver, any further details given for it?

 

[deleted03202021]

Thanks satrow, I've just run latency mon and here are the results:





Can't seem to even see Unknown in the list. Any ideas?

 

[satrow]

The highest count driver listed there that isn't in the original (ignoring the monitoring software drivers) appears to be i8042prt.sys, the PS/2 mouse/keyboard port driver, what keyboard and mouse are you using? Do you have alternatives or USB versions to test with?

It may be that there's a corrupted or infected driver, could youi run through the steps here and have the logs checked over: https://www.sysnative.com/forums/security-arena/2507-malware-removal-posting-instructions.html?

 

[deleted03202021]

I'm using an old Logitech Mx mouse and a newer microsoft Wireless mobile 3500 mouse with an Apple wired keyboard, the logitech uses the PS2 port. In the latency mon report which column am I supposed to be looking at as some seem to have a high results in one but not the other. Thanks again for the help.

 

[satrow]

I'd shutdown, remove the MX mouse, restart and run all the tests again to look for differences, also check the audio output in WMP/Chrome. The column to look at in LatencyMon/Drivers is Total execution, which should I think, equate to the Actual duration column in the WPA report.