https://bugs.kde.org/show_bug.cgi?id=515627
Bug ID: 515627
Summary: Desktop hangs on newer iGPU (AMD AI 340)
Classification: Plasma
Product: kwin
Version First 6.5.3
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
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.
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