Black screen after GRUB on AMD desktop with all kernels later than 6.2.15 on F37 and F38; (no nvidia; KVM switch in use)

[blindcant (bc)]

@py0xc3

f I got you right, everything works fine without the KVM. A bug is possible - indeed keep the bug report updated (including with model data of the KVM).

Yes correct, sorry I may have explained that poorly. Video output works fine without the KVM on all 6.3.x kernels that I tried. But with the KVM I get no video output on all 6.3.x kernels that I’ve tried. I only get video output with the KVM with 6.2.x kernels.

@py0xc3

The first thing I have in mind (since it is related to open issues) is PSR: can you try to boot with the kernel parameter amdgpu.dcdebugmask=0x10 [1][2] ? Does that make a difference? I think there were some changes in PSR in the recent time, could have been in 6.3.

I tried this with kernel 6.3.7 (upgraded this morning) and still no video with the KVM

@py0xc3

Also, have you checked with your preferred search engine if that very KVM model is known to cause issues (and if maybe somewhere on the Internet mitigations are known)?

Unfortunately I couldn’t find anything.

EDIT: The update in [RX 560D] HDMI issues with kernel 6.3 (#2610) · Issues · drm / amd · GitLab seems promising.