[SOLVED] DPC latency from classpnp.sys

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mrb00ce

mrb00ce

Reputable
Jul 28, 2020
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I could hear light crackling noise from my PC so i decided to run dpc latency checker and the graph showed everything to be yellow and it said there's nothing wrong with my system, then I installed latencymon and it said classpnp.sys is causing the issue.
Can any windows 10 masters help me fix this issue.
 
Solution
Colif
classpnp.sys - scsi class system driver
normally runs alongside storport.sys to run your storage drives

I suspect fix is to replace a driver. I don't know what you have though.

Can you download and run Driverview - http://www.nirsoft.net/utils/driverview.html
All it does is looks at drivers installed; it won't install any (this is intentional as 3rd party driver updaters often get it wrong)

When you run it, go into view tab and set it to hide all Microsoft drivers, will make list shorter.

Can you take a screenshot from (and including)Driver name to (and including)Creation date.

upload it to an image sharing website and show link here

crackling noise could be you need to update audio drivers. they are one cause...
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Colif

Colif

Win 11 Master
Moderator
Jun 12, 2015
66,418
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classpnp.sys - scsi class system driver
normally runs alongside storport.sys to run your storage drives

I suspect fix is to replace a driver. I don't know what you have though.

Can you download and run Driverview - http://www.nirsoft.net/utils/driverview.html
All it does is looks at drivers installed; it won't install any (this is intentional as 3rd party driver updaters often get it wrong)

When you run it, go into view tab and set it to hide all Microsoft drivers, will make list shorter.

Can you take a screenshot from (and including)Driver name to (and including)Creation date.

upload it to an image sharing website and show link here

crackling noise could be you need to update audio drivers. they are one cause of DPC latency, as are LAN drivers
 
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Solution
mrb00ce

mrb00ce

Reputable
Jul 28, 2020
328
7
4,695
Colif said:
classpnp.sys - scsi class system driver
normally runs alongside storport.sys to run your storage drives

I suspect fix is to replace a driver. I don't know what you have though.

Can you download and run Driverview - http://www.nirsoft.net/utils/driverview.html
All it does is looks at drivers installed; it won't install any (this is intentional as 3rd party driver updaters often get it wrong)

When you run it, go into view tab and set it to hide all Microsoft drivers, will make list shorter.

Can you take a screenshot from (and including)Driver name to (and including)Creation date.

upload it to an image sharing website and show link here

crackling noise could be you need to update audio drivers. they are one cause of DPC latency, as are LAN drivers
Click to expand...
https://ibb.co/7jSSJpL

https://ibb.co/L8vfYcQ
Here are the images, sorry for the late reply I just woke up. Sometimes latencymon says i don't even have an issue with my PC.
 
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