SOFTWARE/OS VERSIONS OS: Arch Linux Kernel: 6.6.37 KDE Plasma Version: 6.1.2 KDE Frameworks Version: 6.3.0 Qt Version: 6.7.2 GPU: AMD Radeon RX 7900 XTX SUMMARY: On login, kwin_wayland will max out the system's CPU by having multiple instances running, all at 100%, causing the system's desktop to entirely freeze up. This began occuring on mesa 1.24.1.2-1 on arch, however mesa 1.24.1.1-1 was working fine and not triggering this issue. I will have multiple instances of the following process, all using 100% CPU: `/usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-@ --xwayland-fd 8 --xwayland-fd 9 --xwayland-display :1 --xwayland-xauthority /run/user/10@@/xauth_pzjRIB --xwayland` If I ssh in and kill *one* of the kwin_wayland processes, it will cause it to kill the others and restart kwin normally, making the system usable again. logs from `journalctl --user -u plasma-kwin_wayland.service -b`: ``` Jul 07 08:55:45 thegatekeeper systemd[1349]: Starting KDE Window Manager... Jul 07 08:55:45 thegatekeeper systemd[1349]: Started KDE Window Manager. Jul 07 08:55:45 thegatekeeper kwin_wayland[1401]: No backend specified, automatically choosing drm Jul 07 08:55:45 thegatekeeper kwin_wayland_wrapper[1401]: _amdgpu_device_initialize: amdgpu_query_info(ACCEL_WORKING) failed (-13) Jul 07 08:55:45 thegatekeeper kwin_wayland_wrapper[1401]: amdgpu: amdgpu_device_initialize failed. Jul 07 08:55:58 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:55:59 thegatekeeper kwin_wayland_wrapper[1651]: The XKEYBOARD keymap compiler (xkbcomp) reports: Jul 07 08:55:59 thegatekeeper kwin_wayland_wrapper[1651]: > Warning: Unsupported maximum keycode 708, clipping. Jul 07 08:55:59 thegatekeeper kwin_wayland_wrapper[1651]: > X11 cannot support keycodes above 255. Jul 07 08:55:59 thegatekeeper kwin_wayland_wrapper[1651]: > Warning: Could not resolve keysym XF86KbdInputAssistPrevgrou Jul 07 08:55:59 thegatekeeper kwin_wayland_wrapper[1651]: > Warning: Could not resolve keysym XF86KbdInputAssistNextgrou Jul 07 08:55:59 thegatekeeper kwin_wayland_wrapper[1651]: Errors from xkbcomp are not fatal to the X server Jul 07 08:56:09 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:56:10 thegatekeeper kcminit[1632]: Initializing "/usr/lib/qt6/plugins/plasma/kcms/systemsettings/kcm_fonts.so" Jul 07 08:56:10 thegatekeeper kcminit[1632]: Initializing "/usr/lib/qt6/plugins/plasma/kcms/systemsettings/kcm_style.so" Jul 07 08:56:52 thegatekeeper kwin_wayland_wrapper[1557]: [dix] couldn't enable device 10 Jul 07 08:56:52 thegatekeeper kwin_wayland_wrapper[1557]: [dix] couldn't enable device 11 Jul 07 08:56:52 thegatekeeper kwin_wayland_wrapper[1557]: [dix] couldn't enable device 12 Jul 07 08:57:06 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:57:31 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:57:40 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:57:48 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:57:57 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:58:05 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:58:14 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:58:22 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:58:31 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:58:39 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:58:48 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:58:56 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:59:05 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:59:13 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:59:21 thegatekeeper kwin_wayland[1401]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug Jul 07 08:59:25 thegatekeeper kwin_wayland[2399]: No backend specified, automatically choosing drm Jul 07 08:59:25 thegatekeeper kwin_wayland_wrapper[2574]: The XKEYBOARD keymap compiler (xkbcomp) reports: Jul 07 08:59:25 thegatekeeper kwin_wayland_wrapper[2574]: > Warning: Unsupported maximum keycode 708, clipping. Jul 07 08:59:25 thegatekeeper kwin_wayland_wrapper[2574]: > X11 cannot support keycodes above 255. Jul 07 08:59:25 thegatekeeper kwin_wayland_wrapper[2574]: > Warning: Could not resolve keysym XF86KbdInputAssistPrevgrou Jul 07 08:59:25 thegatekeeper kwin_wayland_wrapper[2574]: > Warning: Could not resolve keysym XF86KbdInputAssistNextgrou Jul 07 08:59:25 thegatekeeper kwin_wayland_wrapper[2574]: Errors from xkbcomp are not fatal to the X server Jul 07 08:59:25 thegatekeeper kcminit[2589]: Initializing "/usr/lib/qt6/plugins/plasma/kcms/systemsettings/kcm_fonts.so" Jul 07 08:59:25 thegatekeeper kcminit[2589]: Initializing "/usr/lib/qt6/plugins/plasma/kcms/systemsettings/kcm_style.so" Jul 07 09:00:31 thegatekeeper kwin_wayland[2399]: kf.windowsystem: static bool KX11Extras::mapViewport() may only be used on X11 Jul 07 09:00:31 thegatekeeper kwin_wayland[2399]: kwin_scene_opengl: 0x2: GL_INVALID_VALUE in glTexStorage2D(width, height or depth < 1) Jul 07 09:00:31 thegatekeeper kwin_wayland[2399]: kwin_scene_opengl: Invalid framebuffer status: "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT" Jul 07 09:00:31 thegatekeeper kwin_wayland[2399]: kwin_scene_opengl: 0x2: GL_INVALID_OPERATION in glBindFramebuffer(non-gen name) Jul 07 09:00:31 thegatekeeper kwin_wayland[2399]: kwin_scene_opengl: 0x2: GL_INVALID_FRAMEBUFFER_OPERATION in glClear(incomplete framebuffer) ```
Curiously if I skip using LightDM and just directly do ``` export QT_LOGGING_RULES="kwin_*.debug=true" startplasma-wayland > ~/startplasma-wayland.log 2>&1 ``` the KDE session comes up just fine with no errors. Which makes me wonder if this is somehow related to whatever Lightdm is doing to start up the session.
Yeah. Switching over to SDDM instead of Lightdm makes this issue not able to be reproduced, so I'm thinking this may have been a bug with Lightdm. This ticket can either be held open to investigate the interaction with lightdm and kwin or the ticket can possibly be closed as not a KDE issue. I'm fine with either decision.
About the plageflips, see also bug #493754