Bug 483418 - On Wayland with 2 monitors, severe flickering on the one plugged into an NVIDIA GPU
Summary: On Wayland with 2 monitors, severe flickering on the one plugged into an NVID...
Status: REPORTED
Alias: None
Product: kwin
Classification: Plasma
Component: multi-screen (show other bugs)
Version: 6.0.2
Platform: Arch Linux Linux
: NOR major
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: multiscreen, wayland
Depends on:
Blocks:
 
Reported: 2024-03-13 09:51 UTC by Hosein
Modified: 2024-03-25 17:14 UTC (History)
4 users (show)

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Description Hosein 2024-03-13 09:51:36 UTC 
I have enabled drm mod setting
I didn't have this issue on plasma 5.
My computer has an Nvidia GTX 1650 with latest drivers installed and an Intel integrated GPU
I have two monitors. I connect one of them to the integrated GPU and another to my Nvidia.
I see so many flickering on monitor that is connected to Nvidia.
It's notable that if I connect just one of them and not two of them it works
Comment 1 Nate Graham 2024-03-13 21:30:06 UTC 
Which one flickers? Is it always the one plugged into the NVIDIA GPU?
Comment 2 Nate Graham 2024-03-13 21:30:20 UTC 
Also, is this happening on X11, or Wayland, or both?
Comment 3 Hosein 2024-03-14 01:26:39 UTC 
(In reply to Nate Graham from comment #1)
> Which one flickers? Is it always the one plugged into the NVIDIA GPU?

Yes
Comment 4 Hosein 2024-03-14 01:26:59 UTC 
(In reply to Nate Graham from comment #2)
> Also, is this happening on X11, or Wayland, or both?

Just Wayland
Comment 5 Hosein 2024-03-14 01:28:19 UTC 
It's also notable that if I run sddm with wayland and kwin it does not flicker
Comment 6 Nate Graham 2024-03-14 16:29:54 UTC 
Thanks.
Comment 7 Zamundaaa 2024-03-15 02:10:51 UTC 
Do you see the flickering only in some apps, or on the whole screen?
Comment 8 Hosein 2024-03-15 10:11:07 UTC 
(In reply to Zamundaaa from comment #7)
> Do you see the flickering only in some apps, or on the whole screen?

On the whole screen. When some app or cursor refresh whole monitor will flicker
Comment 9 Zamundaaa 2024-03-15 18:54:53 UTC 
Okay, that's pretty odd then. What version of the proprietary drivers are you on? I can't see any flickering with 550
Comment 10 Hosein 2024-03-23 19:01:49 UTC 
(In reply to Zamundaaa from comment #9)
> Okay, that's pretty odd then. What version of the proprietary drivers are
> you on? I can't see any flickering with 550

Latest. 555
Comment 11 Hosein 2024-03-23 19:04:08 UTC 
(In reply to Hosein from comment #10)
> (In reply to Zamundaaa from comment #9)
> > Okay, that's pretty odd then. What version of the proprietary drivers are
> > you on? I can't see any flickering with 550
> 
> Latest. 550
Comment 12 Hosein 2024-03-23 19:05:35 UTC 
Sorry. I checked now it's 550. I made a mistake
Comment 13 Hosein 2024-03-25 16:00:23 UTC 
i run kwin-wayland command and findout that it flickers in kwni itself too.
guess the problome is with kwin. 

i also checked logs. didnt find anything related
Comment 14 Zamundaaa 2024-03-25 17:14:52 UTC 
hmm yeah nested kwin wayland flickering isn't entirely surprising, we'll need to implement explicit sync in it. Can you file a separate bug report for that please?