Bug 483418

Summary:	On Wayland with 2 monitors, severe flickering on the one plugged into an NVIDIA GPU
Product:	[Plasma] kwin	Reporter:	Hosein <hosein.lavaei.06>
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	major	CC:	hosein.lavaei.06, nate, vlad.zahorodnii, xaver.hugl
Priority:	NOR	Keywords:	multiscreen, wayland-only
Version First Reported In:	6.0.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

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?

Comment 15 Zamundaaa 2025-10-17 11:01:09 UTC

Does this still happen with Plasma 6.4 and latest NVidia drivers? NVidia fixed a lot of things in their drivers since 550.

Comment 16 Bug Janitor Service 2025-11-01 03:47:56 UTC

🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!

Comment 17 Bug Janitor Service 2025-11-16 03:48:19 UTC

🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.