Final update DPC latency spike caused by two monitors

1 : Anonymous2021/10/28 08:43 ID: qhiiy4

After doing a bunch of testing, I've concluded that the issue is indeed a driver related one. In the previous thread (you can find a video displaying the behaviour on the previous thread) I tested a bunch of things that could be causing the issue and found out that my second screen was the culprit. The work around was to not display animations on the second screen or to disconnect it. Now after further testing I've found that that if I enable eyefinity, the DPC latency spike also doesnt happen, which leads me to believe that the issue is mainly caused by GPU acceleration. On Nvidias side there is an option that can be enabled to allow for GPU acceleration on multiple screens, but as far as I know no such thing exists for AMD. I've been in contact with AMD support and hopefully they can provide a fix to this issue.

2 : Anonymous2021/10/28 13:50 ID: hidpla1

I've been having the same problem for months. Made few threads about it and many people posted they are facing the same or somewhat similar issues aswell.

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I contacted AMD since I made the first post, so about 5months ago, also reported it on the bug report thing on the Adrenaline software but the issue still persists. I have 0 faith they gonna fix it anytime soon.

I had problems using a vega 56 back then when using 2 different monitors @ different refresh rates and that issue has been solved 1 or 2 months ago, they literally took years to fix it.

ID: hifguze

This is indeed annoying, especially since there are some that dont have the issue.

3 : Anonymous2021/10/28 10:23 ID: hid42aw

so if you run browser with gpu acceleration off you get no spikes?

ID: hidc2p4

Currently using edge and the answer is yes. With GPU acceleration off and displaying a video, the dxgkrnl.sys driver almost never spikes above 1ms, mostly 800us.

4 : Anonymous2021/10/28 12:46 ID: hidhkg5

Could this be related to the pesky bug on refresh rates across multiple monitors with different refresh rates? I've noticed that any GPU-accelerated app on a 60Hz will tear a new one to your frames on the 144Hz main monitor.

ID: hidk3is

I tried having them on 75hz and 60, but nothing worked. It might be related, but I dont know.

5 : Anonymous2021/10/28 10:34 ID: hid4wgd

did you try disabling CPPC and prefered cores? This was in issue with zen 2..

ID: hidbmka

I havent tried that, where could I enable this.

ID: hieje6g

in bios.. you turn it off both CPPC and CPPC Prefered Cores.. this was an issue that 3900x owner reported at its release.. but its possible its fixed.. well should be fixed.. anyway i run CPPC off ..ive checked my performance and i get no loss..

ID: hidbqkn

Wasn't that fixed with last chipset driver?

ID: hidc8ro

I currently have the latest chipset driver installed, if thats what causing the issue, then I dont think that's the case. I'll test later, that said where can I change these settings.

6 : Anonymous2021/10/28 10:55 ID: hid6ley

which nvidia setting are you talking about? can you describe "exactly"?

ID: hidbgik

You can find the solution in this thread. If my assumptions are correct, this could also be whats actually causing my issue (and perhaps that of other setups).

7 : Anonymous2021/10/28 12:53 ID: hidif9k

I have this with 1 monitor, although in my case it's extremely rare overall. Like maybe once every 2 weeks with 8 hours a day usage of my PC, and it lasts for about 3 seconds.

ID: hidk8oa

Driver conflicts can cause this also. If you keep experience this, try updating drivers and also bios.

ID: hidl5lg

I think it's a Nvidia 3000 series issue or a PCIE Gen 4 bug, since I never had this issue when I had my 1070 installed. It's been happening less since the last two Nvidia drivers, so that's an improvement I suppose.

8 : Anonymous2021/10/28 14:55 ID: hidyrdm

Hello, would you mind to share where to find the option to use gpu acceleration in several monitors with nvidia? Thanks

ID: hiehf4h

You can find the solution in this thread.

9 : Anonymous2021/10/28 15:08 ID: hie0oa2

dwm in Windows 11 handles that much better, it's smooth smooth here on 11, as opposed to 10.

10 : Anonymous2021/10/28 10:09 ID: hid307r

Windows key - > graphics - > graphics settings - > enable HAGS

ID: hidbkg0

enable HAGS

Whats hags?

ID: hidreru

Hardware Accelerated Graphics Scheduling

Currently only available on UWP drivers and comes with its own share of instability.

I have the same problem as you and thought I was imagining it. I think it's been happening since 21.10.1 which incidentally added SAM/REBAR support for my 5700XT. Hmm.

ID: hie0k3m

haggis, sheep gut pie

ID: hidcags

Why won't you go into those windows settings and read it by yourself?!


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