https://bugzilla.kernel.org/show_bug.cgi?id=200695
Bug ID: 200695 Summary: Blank screen on RX 580 with amdgpu.dc=1 enabled (no displays detected) Product: Drivers Version: 2.5 Kernel Version: 4.18.0-rc7 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: claude@mathr.co.uk Regression: No
Created attachment 277633 --> https://bugzilla.kernel.org/attachment.cgi?id=277633&action=edit dmesg after boot with amdgpu.dc=1 amdgpu.dc_log=1 drm.debug=6
When amdgpu.dc=1 is initialized at boot, the console goes blank as it thinks all displays are disconnected. Xorg is not able to enable the display either. With amdgpu.dc=0 all is fine. Tried with various (mostly Debian) kernels from 4.16 through 4.18~rc4, all have the issue. I built a 4.18~rc7 from kernel.org to rule out Debian patches being the issue and will provide logs.