Created attachment 142582 [details] dmesg When I close the laptop lid, the screen turns off, and the following appears in dmesg: [ 5802.486819] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* displayport link status failed [ 5802.486840] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock recovery failed [ 5803.077555] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* displayport link status failed [ 5803.077576] [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock recovery failed When I open the lid, the screen stays blank. I'm running Slackware Current with a kernel built from drm-next-4.21-wip.
Created attachment 142583 [details] Kernel config file
Does amdgpu.dc=1 on the kernel command line help?
It doesn't help. In addition, the screen goes blank when KMS is engaged.
Created attachment 142595 [details] dmesg with amdgpu.dc=1
Correction: due to the screen going blank during boot, I didn't test closing the lid.
Just tried with the latest from wip: problem persists.
Tried with wip from 12/19 and dc=1: display now turns on when laptop is opened, and the error messages no longer appear.
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