SUMMARY Whe boot or reboot, the sddm doesn't started and just give me the black screen. Doing control + alt + f4, and systemctl restart sddm, them sddm start properly The error message is that: ● sddm.service - Simple Desktop Display Manager Loaded: loaded (/usr/lib/systemd/system/sddm.service; enabled; preset: enabled) Active: active (running) since Mon 2025-01-27 08:52:19 -03; 36s ago Docs: man:sddm(1) man:sddm.conf(5) Main PID: 770 (sddm) Tasks: 2 (limit: 18442) Memory: 21.4M (peak: 23.6M) CPU: 118ms CGroup: /system.slice/sddm.service └─770 /usr/bin/sddm jan 27 08:52:20 karis sddm[770]: Adding new display... jan 27 08:52:20 karis sddm[770]: Loaded empty theme configuration jan 27 08:52:20 karis sddm[770]: Xauthority path: "/run/sddm/xauth_KylhYs" jan 27 08:52:20 karis sddm[770]: Using VT 2 jan 27 08:52:20 karis sddm[770]: Display server starting... jan 27 08:52:20 karis sddm[770]: Writing cookie to "/run/sddm/xauth_KylhYs" jan 27 08:52:20 karis sddm[770]: Running: /usr/bin/X -nolisten tcp -background none -seat seat0 vt2 -auth /run/sddm/xauth_KylhYs -noreset -displayfd 16 jan 27 08:52:20 karis sddm[770]: Failed to read display number from pipe jan 27 08:52:20 karis sddm[770]: Display server stopping... jan 27 08:52:20 karis sddm[770]: Attempt 1 starting the Display server on vt 2 failed STEPS TO REPRODUCE 1. Install Neon Unstable 2. SDDM fail 3. Do control + alt + f4 and systemctl restart sddm, them sddm start properly OBSERVED RESULT sddm doesn't started EXPECTED RESULT sddm started properly SOFTWARE/OS VERSIONS ADDITIONAL INFORMATION Operating System: KDE neon Unstable Edition KDE Plasma Version: 6.3.80 KDE Frameworks Version: 6.11.0 Qt Version: 6.8.1 Kernel Version: 6.12.9-x64v3-xanmod1 (64-bit) Graphics Platform: Wayland Processors: 4 × AMD A12-9720P RADEON R7, 12 COMPUTE CORES 4C+8G Memory: 15.1 GiB of RAM Graphics Processor 1: AMD Radeon R7 Graphics Graphics Processor 2: AMD Radeon 500 Series Manufacturer: Acer Product Name: Aspire A515-41G System Version: V1.09
I have a similar issue only on one of my Gentoo. The thing I can see in journalctl -b: oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: "kwin_core: Failed to open /dev/dri/card0 device (Device or resource busy)\n" oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: "kwin_wayland_drm: failed to open drm device at \"/dev/dri/card0\"\n" oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: "kwin_wayland_drm: No suitable DRM devices have been found\n" oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: "QThreadStorage: entry 7 destroyed before end of thread 0x558d64fe87d0\nQThreadStorage: entry 1 destroyed before end of thread 0x558d64fe87d0\nQThreadStorage: entry 0 destroyed before end of thread 0x558d 64fe87d0\n" oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: wayland compositor finished 1 QProcess::NormalExit oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: quitting helper-start-wayland oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: Stopping... "/usr/bin/sddm-greeter-qt6" oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: wayland greeter finished 15 QProcess::CrashExit oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper-start-wayland[1033]: quitting helper-start-wayland oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper[991]: [PAM] Closing session oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper[991]: pam_unix(sddm-greeter:session): session closed for user sddm oct. 15 12:45:53 ordiyp.taniere.lan sddm-helper[991]: [PAM] Ended. oct. 15 12:45:53 ordiyp.taniere.lan sddm[976]: Auth: sddm-helper exited successfully oct. 15 12:45:53 ordiyp.taniere.lan sddm[976]: Greeter stopped. SDDM::Auth::HELPER_SUCCESS My sddm configuration is set to use Wayland, not X. And if I perform a systemctl restart sddm, from console (Ctrl+Alt+F2), sddm starts correctly.