Hello,
Greatly appreciate if someone knows what to do here:
I just got a sapphire 9070 XT GPU to replace my 1070 ti and I am getting this error.
Tried troubleshooting for a while to no avail, I can’t seem to find having this failure specifically.
I first removed nvidia drivers, plugged in the card, I missed a MOK screen (maybe that is the issue? I don’t know the mokutil for AMD though), secure boot or not I am getting the same DMCUB error.
All the usual info tools showed the card was recognized, couldn’t get my DE though.
The only attempt I could find is adding to my grub CMDLINE: amdgpu.dcdebugmask=0x210, that caused a hang on the _ OS load, maybe I misentered it. I’m not familiar enough yet with grub.
So I snapper rollbacked to a save I made before attempting and put my 1070 ti back in to write this post.
Next time I try I will be more deliberate with each stage of the swap. Maybe it will catch or someone has an idea I’m sure this is workable…