Arch Linux

ant77i

Member

Registered: 2024-02-02

Posts: 25

[SOLVED] Second monitor glitches when connected

I recently got a second monitor, but when I try to connect it to my pc, it starts glitching.

Here's a photo: img

I confirmed it's not an issue with the monitor itself, as it works on a windows install. I currently have my main monitor connected to the motherboard HDMI and the second monitor is connected to the GPU, also by HDMI.
The monitor that glitches is the one that's connected to the motherboard, as when I swap them (connect main monitor to motherboard) the main monitor starts glitching.

Last edited by ant77i (2024-02-05 10:56:03)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,205

Re: [SOLVED] Second monitor glitches when connected

Which GPUs? And it's generally not exactly trivial to have a shared framebuffer/graphics subsystem on completely distinct hardware. It'd be better if you get both on the same GPU, do you just not have more ports or are other ports DP?

In any case, to investigate, post your xorg log (if you're using wayland, this problem is likely more pronounced as well and you might want to test xorg) and the journal of your current boot

sudo journalctl -b

https://wiki.archlinux.org/title/List_o … n_services

ant77i

Member

Registered: 2024-02-02

Posts: 25

Re: [SOLVED] Second monitor glitches when connected

I don't have any more HDMI ports on the GPU, and I don't have a DP cable, so the only other option is to connect to the motherboard.
I solved this by switching to X11, so this seems to be an issue with Wayland.

Anyway, I don't know if this can be fixed on Wayland, but here's a link to the journal log

Last edited by ant77i (2024-02-05 11:25:50)

xstraok

Member

Registered: 2022-03-16

Posts: 8

Re: [SOLVED] Second monitor glitches when connected

This is a kde wayland issue. Other wayland compositors that i've tested work fine with this setup

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,205

Re: [SOLVED] Second monitor glitches when connected

There are a lot of bugfixes for this usecase in Plasma 6 maybe give that a shot via testing repos or wait for the release.