Regression: short time display corruption during resume

Submitted by Rafał Miłecki

Assigned to Default DRI bug account

Link to original bug (#109554)

Description

I use HP EliteBook 745 G5 with Ryzen 5 PRO 2500U.

Starting with the:
commit 009d9ed6c4b7b84dbff8314d74233da9237a4560
Author: Rex Zhu Rex.Zhu@amd.com
Date: Sun Sep 30 17:37:27 2018 +0800

drm/amdgpu: Change AI gfx/sdma/smu init sequence

initialize gfx/sdma before dpm features enabled.

Acked-by: Alex Deucher alexander.deucher@amd.com
Signed-off-by: Rex Zhu Rex.Zhu@amd.com
Signed-off-by: Alex Deucher alexander.deucher@amd.com

During most resumes from RAM I see a display with black screen & some corruptions for a 1 second or less.

This is not critical but since it's a tracked regression I decided to report it with a hope it's something easy & possible to fix. After that second (or less) displays shows an expected image (KDE lock screen) and everything works normal afterwards.

This problem still exists in the 5.0.0-rc3.