I'm hitting the same hang, but with the previous firmware version too (linux-firmware-amd-graphics 20260319.git217ca6e4-0ubuntu3, not just the .1 point release) — anecdotally the older version seems to hang less often for me, though I haven't done a rigorous count.
One behavioral detail that might help narrow this down: when it hangs, the power LED does not go into the slow-breathing "sleeping" pattern — the machine appears to stay fully awake/powered. Combined with the kernel log ending right at PM: suspend entry (s2idle) with nothing after (confirmed even with dyndbg=file drivers/base/power/main.c +p enabled), this points to the hang happening during suspend entry — likely stuck in a device suspend() callback — rather than a failed resume. Attaching what was asked for: - journalctl -b -1 (kernel messages, redacted of hostname/serials) - amdgpu_firmware_info - amd-s2idle report (redacted) — note this particular manually-triggered 10s test cycle actually completed successfully, no hang. The hang looks intermittent/timing-dependent rather than reproducible on every suspend. System: Lenovo ThinkPad P16s Gen 4 AMD, Ryzen AI 5 PRO 340 w/ Radeon 840M (Krackan Point), kernel 7.0.0-29-generic, Ubuntu 26.04. ** Attachment added: "bug-2162104-debug-info.zip" https://bugs.launchpad.net/ubuntu/+source/linux-firmware-amd-graphics/+bug/2162104/+attachment/5989839/+files/bug-2162104-debug-info.zip -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2162104 Title: linux-firmware-amd-graphics 0ubuntu3.1 DMCUB fix causes suspend hang on Krackan APU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware-amd-graphics/+bug/2162104/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
