> [ 15.194010] amdgpu 0000:76:00.0: [drm] *ERROR* > dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data > [ 15.403007] amdgpu 0000:76:00.0: [drm] *ERROR* > dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data > [ 15.613896] amdgpu 0000:76:00.0: [drm] *ERROR* > dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data
Given log items like this; it's more likely a regression in the linux- firmware than the kernel IMO. Here is how I suggest you go forward. 1) clone linux-firmware: https://gitlab.com/kernel-firmware/linux-firmware 2) Check out a tag from a year ago (line in the sand) 3) Copy amdgpu/yellow_carp_dmcub.bin to /lib/firmware/updates/amdgpu/ 4) Rebuild initramfs and reboot system. You will confirm it loaded by it either working (great!) or by seeing the new version loaded in the logs. [ 14.182896] amdgpu 0000:76:00.0: amdgpu: [drm] DMUB hardware initialized: version=0x04000047 If it works; then "bisect" this linux-firmware tree to figure out where it broke. To do this you can do a bisect just like the kernel (or any other project). You just happen to know exactly which file changed so you can run the bisect on just that file rather than the whole tree. Narrow down which commit caused it and then please open a bug here: https://gitlab.freedesktop.org/drm/amd/-/issues. ** Also affects: linux-firmware (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2144530 Title: Regression on Acer Nitro AN17-41: amdgpu DC/DMUB fails to light up internal eDP and Radeon-routed USB-C/DP outputs on Ubuntu 26.04 / kernel 6.19, while Ubuntu 24.04.4 live works To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2144530/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
