[Bug 106317] System lock up after monitors wake from DPMS on Ryzen 3 2200g

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106317

            Bug ID: 106317
           Summary: System lock up after monitors wake from DPMS on Ryzen
                    3 2200g
           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: laszlo.kertesz at gmail.com

I have a Ryzen 3 2200g CPU on a Gigabyte AB350M-HD3 mobo. I have 2 monitors
connected (same model), one via HDMI, the other via DVI.

OS: Debian Testing, kernel compiled from mainline git (rc2+ now, after the rc3
DRM fixes patches merge). But this issue is present even with the kernel from 
https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-4.18-wip

The issue i encounter is the when the monitors enter dpms and tries to wake,
the system freezes. 

This is not happening always, but it can be reproduced reliably with running 
"DISPLAY=:0 xset dpms force off"
Repeatedly. It will eventually lock up (minimum tries was 1, max 9).
One of the monitors (HDMI) will have the signal still cut, the other (DVI) will
have a blank signal (this behavior seems consistent).

The system freezes totally (no ssh access, ping, magic keys etc). Also no
usable logs. This is compounded by the issue of having to reboot repeatedly
after this issue since the system will freeze at reboot when the KMS mode is
enabled.

Maybe unrelated but i have this line in dmesg after each boot:

[    5.312547] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector
ObjectID from Adapter Service for connector index:2! type 0 expected 3

xrandr output:

HDMI-A-0 connected primary 1440x900+1440+0 (normal left inverted right x axis y
axis) 408mm x 255mm
   1440x900      59.89*+  74.98  
   1280x1024     75.02    60.02  
   1280x800      59.89  
   1152x864      75.00  
   1280x720      59.89  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
DVI-D-0 connected 1440x900+0+0 (normal left inverted right x axis y axis) 408mm
x 255mm
   1440x900      59.89*+  74.98  
   1280x1024     75.02    60.02  
   1280x800      59.89  
   1152x864      75.00  
   1280x720      59.89  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
DisplayPort-0 disconnected (normal left inverted right x axis y axis)

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