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TheDcoder

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Registered: 2020-06-06

Posts: 117

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Display resets when viewing full-screen media in KDE Plasma Wayland

I have a weird issue where the display seems to "reset" or "restart" whenever I try to view media in full-screen, by full-screen I mean opening the full-screen view by using whatever option or hotkey toggles in an affected program.

It doesn't happen all the time, and it doesn't always happen immediately, but once it starts happening it will result in the display completely blank out for a second or two and then resuming working normally only for it to happen it after another second or so, the cycle repeats for a random number of times before it stabilizes but it can become unstable soon again shortly after a grace period of a few seconds. I also have the audio coming through the monitor's speakers and that also stops when the display goes blank, if I am listening to the audio through my wireless bluetooth headset then it doesn't get affected.

It is as if the display turns off and reboots, as if the actual signal between these blank periods is lost. This issue only happens when some program is displaying in full-screen, it never happens outside that, and it never happens in Xorg, I switched to KDE Plasma Wayland recently.

The few applications I have noticed this happening are:
1. Firefox
2. mpv (media player)
3. Telegram

All of them work perfectly fine when not inside a full-screen, even when playing the same content that would otherwise trigger this issue. There's also another strange phenomenon in full-screen which happens more rarely and might be related to this and I have only observed this in mpv, it results in some slight but noticeable flicker of the displayed content, it also starts and stops randomly.

I tried to look at any errors or any other useful info in the system's journal when this happens but there's absolutely nothing. Any ideas why this might be happening?

Edit: Forgot to mention that I use an Nvidia GPU with the open drivers, the monitor connects to the GPU's DP-out port.

Last edited by TheDcoder (2025-10-05 21:08:55)