[Bug 108843] Laptop with ATI RX 580 doesn't turn the screen on when resuming.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108843

            Bug ID: 108843
           Summary: Laptop with ATI RX 580 doesn't turn the screen on when
                    resuming.
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: alex14641 at yahoo.com

Created attachment 142582
  --> https://bugs.freedesktop.org/attachment.cgi?id=142582&action=edit
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.

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