https://bugs.kde.org/show_bug.cgi?id=448220
--- Comment #53 from SP <scp.stj...@gmail.com> --- (In reply to Zamundaaa from comment #44) > The only suspicious thing I can see here is that in some areas of the log > there's commits without any pipelines printed: > > kwin_wayland_drm: committing pipelines > > kwin_wayland_drm: (list done) > but the rest of the log suggests that's not a behavior bug of KWin but > probably some weirdness with logging instead. > Both monitors still get presented and KWin gets responses from the kernel > that the presentations do in fact happen. So from the PoV of KWin everything > is completely fine - this would suggest that it's a kernel bug. > > There's two more data points we can gather: > 1. the output of drm_info when you're in SDDM (you can get it by logging in > via ssh and executing drm_info with sudo) and when you're in the broken > session > 2. if you uninstall xf86-video-amdgpu, reboot and let the default Xorg > driver take over, which uses the same driver interface as kwin_wayland, do > sddm and the Plasma X11 session start exhibiting broken behavior as well, or > does it continue working fine? The removal of xorg-x11-drv-amdgpu definitely resolved the problem. There must exist some conflict between this and the built-in kernel amdgpu driver . As I am using Wayland I would have thought this irrelevant - but since deinstalling the xorg-x11-drv-amdgp driver I have not had a recurrence of this problem on either of our computers with dual monitors. Thank you @Zamundaaa for the tip. I will mark this as resolved. -- You are receiving this mail because: You are watching all bug changes.
