Plasma: 6.5.x KWin: 6.5.3 Session: Wayland GPU: AMD AI 340 (Framework laptop) Kernel: Linux 6.18.x and lts UEFI firmware: 3.04 and 3.05 (latest) Description: session hangs after login. The hang appears in 3 forms: immediatly (Most common): only wallpaper and mouse is visible, no interaction works. after a few seconds (uncommon): desktop loads (files, icons, desktop bar,...) but no interation works. ~8 second span (rare): desktop loads and ineractions work until hang. While the first 2 symptoms are the most common, the third one was achieved by downgrading kwin or by forcing openGL backend, but I believe it is noise since it was a consistent increase, type 1 still occurs. In the hang state trying to escape to TTY with ctrl+alt+f2 yields a completly black screen. A second try also gave a completly frozen sddm screen with an X shaped cursor after flashing a black screen. Thus the only escape I used is forced shutdown through power button hold. I looked at the journal with 'journalctl -b -1' and as expected there were no warnings nor errors. This is my strongest evidence that it is a hang. I installed x11 session, it appears to work (went in 3 times, so it appears reliable). Thus I believe it is wayland only. downgrading kwin alone from 6.5.3 to 6.5.1 or 6.4.7 did not fix. downgrading all packages to 2026/01/25 is stable (I used it for 8 days before updating). 2026/01/31 seems stable but I did observe the hang once. beyond 2026/02/01 it is unstable. This behavior suggests a timing or race condition related regression rather than a single deterministic change. NOTE: The dates refer to ALA (Arch linux Archive). On my machine The feb 1 update only involved: archlinux-keyring noto-fonts python-numpy python-wcwidth python-wheel yt-dlp from which only noto-fonts stood out. But it is unrelated as excluding that package does not stop hangs. The update from Jan 31 involves many KDE packages it is also has the earliest presence of the hang. I wasn't able narrow it to single package due to the inconsistent nature of the bug. If needed I will share additional diagnostics and preform the necessary experiments.
I forgot to mention the kernel flag 'nomodeset' prevents it. I've been using it with that flag between the experiments I conducted.
Please reproduce the hang, and then attach the output of > journalctl --user-unit plasma-kwin_wayland --boot 0 and > journalctl -k --boot 0 (or "--boot -1" if you reboot in between) If you enable ssh, you can get the logs and shut down from ssh without forcing poweroff.
Steps I followed to reproduce: pacman -Syu reboot This was instance of the most common type of hung with only wallpaper and cursor appearing. While it was hanging I waited a little bit, then I pressed ctrl+alt+fn+f2 to switch to TTY to get further diagnostics. This time SDDM reappeared with an X-shaped cursor. The cursor could move, but all UI elements were unresponsive. I forced shutdown via power button hold. on next boot I appended nomodeset. journalctl --user-unit plasma-kwin_wayland --boot -1 > kwin.log journalctl -k --boot -1 > kernel.log sudo pacman -Syyuu --config /etc/ALApacman.conf reboot For ssh I need a second device so it is little bit difficult. If it is needed later I'll use it. I'll attach the documents shortly after this comment.
Created attachment 189317 [details] journalctl --user-unit plasma-kwin_wayland --boot -1
Created attachment 189318 [details] journalctl -k --boot -1