Okay, so this is weird. After a few minutes of being logged in the entire desktop hangs only with this particular model of Telefunken TV (TLFK22LEDPVR1), and only if composition is on. I have tried it with another two displays with the same native resolution and refresh rate, and there was no problem.
- Radeon HD5870 - plasma 5.21.3 - mesa 20.3.4 - xorg-server 1.20.10 - linux 5.10
It only happens on xorg, but not on wayland.
I'm seeing it also without composition, but there it's rare to happen. I also figured out that there's a difference between the screens that don't exhibit the problem and this one. This one uses an interlaced signal.
when you say "the entire desktop" are you able to move the mouse?
It varies. Sometimes only the panel becomes unresponsive, others all the content in the screen. If there is music playing in the background it continues playing normally. I confirm you that when using 720p on this screen the desktop doesn't freeze, so this is due to using an interlaced signal.
(In reply to Alberto Salvia Novella from comment #3) > I'm seeing it also without composition, but there it's rare to happen. If that's the case, it indicates that the issue lies either in Xorg or the driver. > I also figured out that there's a difference between the screens that don't > exhibit the problem and this one. This one uses an interlaced signal.
Any idea how to figure which subsystem is to blame? I don't see anything useful in the system logs.
I have tested this only happens with radeon hardware, so that driver is the one to blame.