I experienced the same DMCUB/DMUB issue on a system with a Radeon 680M (YELLOW_CARP / Rembrandt).
My system was running: Fedora 44 Kernel: 7.2.5-200.fc44.x86_64 GPU: Radeon 680M (1002:1681) amd-gpu-firmware-20260916-1.fc44 Even though the installed firmware package was already the fixed 20260916-1 version, dmesg still showed: amdgpu 0000:04:00.0: [drm] Loading DMUB firmware via PSP: version=0x0400004A amdgpu 0000:04:00.0: [drm] *ERROR* Error getting DMUB FW meta info: 4 amdgpu 0000:04:00.0: failed to load ucode DMCUB(0x3F) amdgpu 0000:04:00.0: [drm] Wait for DMUB auto-load failed: 3 amdgpu 0000:04:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data The installed firmware file in /usr/lib/firmware/amdgpu/yellow_carp_dmcub.bin.xz was already 0x0400004C, but the initramfs still contained an older copy of yellow_carp_dmcub.bin.xz. I regenerated all initramfs images with: dracut --regenerate-all --force After rebooting, the system loaded the correct DMCUB firmware (0x0400004C) and the DMCUB/HDMI errors were gone. HDMI output then worked normally. So, in my case, the problem persisted because the initramfs was still containing the older 0x0400004A firmware even after the fixed linux- firmware package had been installed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2167279 Title: Regression in 20260911.giteeccccbe-0ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware-amd-graphics/+bug/2167279/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
