Hi Alessandro, Thanks for the reply.
I've attached the requested files - I added a bonus journal file as I'd had so many crashes after waking up the laptop on the dock. When I run step 2, I get the "Sorry, Ubuntu 26.04..." popup - is that expected? If so, I don't know where to find the ID if you can help me with that please? Thanks, Duncan journal.txt <https://drive.google.com/file/d/19MMjsJdYoCY22XkJt8dvALxzwAz6f7N_/view?usp=drive_web> prevjournal1.txt <https://drive.google.com/file/d/1rOLSpqA2KMq-7IZp4BvkGdlLt-r3MT25/view?usp=drive_web> prevjournal2.txt <https://drive.google.com/file/d/1IQMbfMfIZcdliQ7tF_GrTSqP0MVD9Pkp/view?usp=drive_web> On Tue, 13 Oct 2026 at 10:25, Alessandro Astone <[email protected]> wrote: > Thank you for taking the time to report this bug and helping to make > Ubuntu better. It sounds like some part of the system has crashed. To > help us find the cause of the crash please follow these steps: > > 1. Run these commands: > journalctl -b0 > journal.txt > journalctl -b-1 > prevjournal.txt > and attach the resulting text files here. > > 2. Look in /var/crash for crash files and if found run: > ubuntu-bug YOURFILE.crash > Then tell us the ID of the newly-created bug. > > 3. If step 2 failed then look at https://errors.ubuntu.com/user/ID where > ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine. > Do you find any links to recent problems on that page? If so then please > send the links to us. > > Please take care to avoid attaching .crash files to bugs as we are > unable to process them as file attachments. It would also be a security > risk for yourself. > > ** Changed in: mutter (Ubuntu) > Status: New => Incomplete > > -- > You received this bug notification because you are subscribed to the bug > report. > 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 > > Status in mutter package in Ubuntu: > Incomplete > > Bug description: > 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 > > To manage notifications about this bug go to: > > https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2170675/+subscriptions > > -- Duncan Watson Technical Director Email: [email protected] Hive IT, New Oxford House 30 Barkers Pool Sheffield S1 2HB Web: www.hiveit.co.uk Tel: 0114 270 0669 Registered in England and Wales Company No. 8852342 VAT registration: 180613718 -- 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
