Adding a data point to help pin down the exact blob. I am still holding linux-firmware at 0ubuntu2.26, which is stable on my machine. For comparison with the hash posted in comment #6:
Working (0ubuntu2.26): dcn_3_5_dmcub.bin SHA-256: ce5dc8ef543ce71a0ef772d4d821872fbfaa48afd0634e00f814e04ed991c431 Loaded DMCUB version: 0x09002C01 No lockups, no Oops. Broken (reported in #6 with linux-firmware-amd-graphics 0ubuntu3.2): dcn_3_5_dmcub.bin SHA-256: 3849f6e2dd33c24977254f486710be9ee8f51fb5dad4b442444e119ced0c55d5 Loaded DMCUB version: 0x09000D00 So 0ubuntu3.2 still ships the regressed DCN 3.5 blob. The fix released for the Navi 21 case (LP #2163303) does not address DCN 3.5 / Strix Point. I can also confirm that the test build at people.canonical.com/~juergh/lp2163303/ (0ubuntu2.29+lp2163303) still loads DMCUB 0x09000D00 here, so it does not fix this case either. I reverted to 0ubuntu2.26 and re-applied the hold. Two more notes: - Comment #6 reports the same failure on a Lenovo ThinkPad P16s Gen 4 AMD (Ryzen AI 9 HX PRO 370, Radeon 890M), so this is not vendor- specific: it affects Strix Point / DCN 3.5 generally, on the same 6.17.0-1032-oem kernel. - The stack trace in #6 is worth noting: amdgpu_device_rreg -> dmub_srv_wait_for_idle -> dmub_abm_set_pipe -> amdgpu_dm_atomic_commit_tail. That is the Adaptive Backlight Management path, which suggests the regression is in the ABM handling of the DMCUB firmware rather than something broader. - Also relevant for the package split: the hold on the monolithic linux- firmware package does not cover the new linux-firmware-amd-graphics package. Users who let the split happen may silently get the regressed blob back. My system: SLIMBOOK EXCALIBUR-AMD-AI, Ryzen AI 9 365 / Radeon 890M (gfx1150, DCN 3.5), kernel 6.17.0-1032-oem, Zorin OS 18.1 (Ubuntu 24.04 base), X11. Happy to test any build that targets the DCN 3.5 blob specifically. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2163311 Title: linux-firmware 0ubuntu2.29 regresses DMCUB on DCN 3.5 (Strix Point) causing SDMA0 fence timeout and kernel Oops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2163311/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
