AMDGPU crash when Power Management switches off screen

Submitted by Jason

Assigned to Default DRI bug account

Link to original bug (#107021)

Description

Created attachment 140310
Trace from dmesg

With "Screen Energy Saving" selected in KDE, my screen does not return to active state when I use the keyboard or mouse. Instead, the screen remains blank indefinitely, until system restart or Xorg is killed. This has occurred in Gnome as well as KDE Plasma 5.13. Each time this occurs, dmesg shows a trace similar to the one attached. The system only seems to lock when screen is blanked by power management and I am able to eventually recover by SSHing in and killing Xorg/SDDM. I have not experienced any issues with "Screen Energy Saving" disabled.

Steps to reproduce:

1. Enable "Screen Energy Saving" in KDE (or it's Gnome equivalent).
   
2. Wait time specified and system will not return from screen sleep state.
   

Other relevant information:

Linux: Arch Linux
Kernel: 4.17.2
AMDGPU: 18.0.1
Xorg: 1.20.0
Hardware:
Motherboard: ROG CROSSHAIR VII HERO, BIOS 0702 05/29/2018
GPU: Radeon RX Vega 64

**Attachment 140310**, "Trace from dmesg":
drm_amdgpu_trace.txt