Public bug reported: System Ubuntu 26.04.1 LTS, gnome-shell 50.1-0ubuntu1.3, mutter [version], Wayland session Kernel 7.0.0-38-generic, AMD Radeon 780M (amdgpu) External ASUS PB287Q (4K) through a Dell WD19TB Thunderbolt dock (DP-MST) What happens
When the external monitor wakes from standby (after screen lock or suspend) and the kernel fails to bring the MST link back (amdgpu reports Failed to get ACT; separate kernel bug), mutter's atomic commits start failing with EINVAL. After about 30–90 seconds, gnome-shell aborts on an assertion, which ends the user session and loses open windows. This was never seen on Ubuntu 24.04 (GNOME 46) with the same hardware. Expected Even if the kernel can't light up the monitor, mutter should treat the failed commit or monitor as unavailable and keep running, not abort the whole session. Frequency 4 crashes with the same signature between 7 and 12 Oct (12:52 and 16:49 on 7 Oct, 13:04 and 15:48 on 8 Oct), plus another on 12 Oct at 11:25. Crash reports were submitted via apport/whoopsie. Journal before the abort gnome-shell: Can't update stage views actor unnamed [ClutterActor] is on because it needs an allocation. gnome-shell: Page flip failed: drmModeAtomicCommit: Invalid argument gnome-shell: Failed to post KMS update: drmModeAtomicCommit: Invalid argument gnome-shell: Cursor update failed: drmModeAtomicCommit: Invalid argument systemd: [email protected]: Main process exited, code=dumped, status=6/ABRT ** Affects: mutter (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2170675 Title: gnome-shell crashes with SIGABRT in g_assertion_message_expr() (libmutter-18) after repeated "Page flip failed: drmModeAtomicCommit: Invalid argument" when an MST monitor fails to come back To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2170675/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
