Another freeze occurred on 2026-06-28 at approximately 23:38 local time. No external displays were connected. Only the laptop's internal eDP display was active. The mouse cursor remained movable and Ctrl+Alt+F3 still worked. I recovered the system by terminating the graphical session:
``` loginctl terminate-session $(loginctl list-sessions --no-legend | grep tty2 | xargs | cut -d' ' -f1) ``` This occurrence appears to have been under X11 (`gdm-x-session` is present in the log). The attached `freeze.log` contains a very large burst of kernel bus-lock messages before the freeze: ``` x86/split lock detection: #DB: Core Thread/... took a bus_lock trap x86/split lock detection: #DB: Desktop EventSe/... took a bus_lock trap x86/split lock detection: #DB: Network Thread/... took a bus_lock trap x86/split lock detection: #DB: Media Mixer Ren/... took a bus_lock trap ``` Between approximately 23:34:04 and 23:38:05 there are 420 visible `bus_lock trap` messages. In addition, 42 `handle_bus_lock: ... callbacks suppressed` messages report a total of approximately 14,100 suppressed callbacks. At 23:38:29 Xorg also reports: ``` AMDGPU(0): flip queue failed: Invalid argument AMDGPU(0): Page flip failed: Invalid argument ``` However, these messages coincide with switching to tty3 and: ``` AIGLX: Suspending AIGLX clients for VT switch ``` so the page-flip errors might be a consequence of the VT switch/session termination rather than the original cause. There are no apparent `GPU reset`, `ring timeout`, kernel panic, segfault or OOM messages in this log. Could the bus-lock flood be responsible for freezing the graphical session? Please advise whether this bug should be reassigned or additionally marked as affecting the Linux kernel/amdgpu DRM, and what additional debugging information should be collected. ** Attachment added: "freeze-internal-display-2026-06-28.log.log" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/2157934/+attachment/5979383/+files/freeze-internal-display-2026-06-28.log.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2157934 Title: ThinkPad P14s Gen 6 AMD: graphical session freezes on Radeon 890M (Ryzen AI 9 HX 370) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/2157934/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
