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Secondary Monitor Glitching on KDE Wayland (open source Nvidia driver) (sopuli.xyz)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/[email protected]

13 comments fedilink hide all child comments

Hi everyone, I've neen having this issue when running KDE wayland with multiple screen on my Thinkpad W530. I'm using the nouveau driver.

The primary monitor is fine, but the secondary one is glitching.

This is tested on Gentoo as well as Debian. I know it's not hardware issue because it runs fine on X11.

Anyone have any idea about this issue?

Edit: I should probably mention that I was using DisplayPort in the photo, but I also tried VGA and it gave the same result.

Edit1: I was able to narrow down the problem somewhat. Switching the BIOS setting to "Discrete only" for the GPU (thanks coreboot!) seems to make the glitching go away! This means the Optimus would be to blame.

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[–] [email protected] 20 points 7 months ago (1 children)

First diagonal monitor now trapezoid

[–] [email protected] 7 points 7 months ago

Crazy, rite??

[–] [email protected] 7 points 7 months ago

I have had the exact same issue and I've been looking for a solution. If you really need the second monitor then you can just switch to the x11 session as a temporary fix but I have no idea what actually causes it.

[–] [email protected] 6 points 7 months ago (1 children)

You should cross-post this to: [[email protected]](/c/[email protected])

[–] [email protected] 2 points 7 months ago

I probably should!

[–] [email protected] 4 points 7 months ago

It's a driver bug, it doesn't reject buffers that the GPU can't actually handle correctly.

We've switched to a different way of doing multi-gpu in Plasma 6 that hits at least fewer such bugs.

[–] [email protected] 3 points 7 months ago (1 children)

if those screens use different refresh rates try setting them to the same, hope this will help

[–] [email protected] 5 points 7 months ago

they are not... but they are on different resolution. the primary is on 1080p while the secondary is on HD+

[–] [email protected] 3 points 7 months ago* (last edited 7 months ago) (1 children)

Could be an NVIDIA issue where the fact the external display is connected to the dGPU is causing issues. Nouveau optimus support(rather lack of it) for quattro could also be leading to the issue.

[–] [email protected] 1 points 7 months ago

Yes, I did set the BIOS GPU config to "discrete only" and now it works.

[–] [email protected] 2 points 7 months ago (1 children)

+1 for that Thinkpad

[–] [email protected] 1 points 7 months ago

+1 for Kepler. What a throwback to when The Witcher 2 was the ultimate game for showing off your GPU :')

[–] [email protected] -1 points 7 months ago

It's a common wayland problem. Try editing xf86config to force the scanrate to something your monitor supports rather than relying on dpms ddc/ci auto config