Thanks for the pointer. I ran journalctl -b0 > journal.txt as requested — attached (covers boot from aug 02 12:00 to aug 03 08:20, ~20h uptime, MUTTER_DEBUG_FORCE_KMS_MODE=simple and MUTTER_DEBUG_TRIPLE_BUFFERING=never both disabled during this boot to make sure the freeze could still occur).
I grepped the whole file for drmModeAtomicCommit/Page flip failed/Cursor update failed and found only 3 hits in the entire 20h boot. All three turned out to be unrelated to the actual freeze once I checked their context: - One coincides exactly with a USB dock being unplugged (mass USB disconnect in the same second) - One coincides exactly with the laptop lid closing and suspend starting - One coincides exactly with a Howdy face-login/unlock transition, immediately followed by normal activity (file manager, desktop icons launching fine) None of them line up with the actual freeze I experienced this morning (external LG monitor showing fullscreen video + scrolling on the laptop screen, after docking and resuming from suspend — whole external output froze including the cursor, recovered via VT-switch Ctrl+Alt+F3→F2). I also checked for any gap in journal timestamps during that session (looking for a period where the system itself might have stalled) — no gap over ~60 seconds anywhere, so the rest of the system keeps logging normally while the compositor/output silently stops producing frames. This matches two earlier incidents I had, which were also completely silent in the logs. So: the default journal doesn't seem to capture anything at all during the actual stall. Is there a more verbose debug mechanism I could enable ahead of time to catch this — e.g. MUTTER_DEBUG=kms or similar — that would log KMS/atomic-commit/frame-scheduling activity even when nothing rises to the level of a normal log message? Happy to run with that enabled for a few days and report back once it reproduces. ** Attachment added: "journal.txt" https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2162087/+attachment/5988908/+files/journal.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2162087 Title: External monitor freezes completely (incl. cursor) on Meteor Lake iGPU, audio continues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2162087/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
