AMD RX 570 Black Screen/Hang at startup (AMDGpu DC problem)

Submitted by Surena Karimpour

Assigned to Default DRI bug account

Link to original bug (#111299)

Description

Hello, AMD RX 570 faces a blank, black screen at boot. This started happening after linux kernel 4.17 started enabling amdgpu DC by default, and only solution (for now) is disabling amdgpu DC using amdgpu.dc=0 kernel boot parameter.

Here is like to original bug, in Ubuntu's tracker:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1837945

Sytem information (inxi -SGxxx): https://paste.ubuntu.com/p/sWW27FBwCG/