[Bug 112288] Blank display on Ubuntu 19.10 on Ryzen 3 2200G and Ryzen 5 2400G APUs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112288

--- Comment #8 from Peter D. <peter_s_d at fastmail.com.au> ---
Hi, 

I'm the Peter D. who raised the Ubuntu bug report - writing from a different
email address.  I can probably bisect the kernel with a little gentle
instruction. 

Initial results are;
Raven ridge APU, VGA port, slow monitor (75Hz max refresh rate),
booting with nomodeset gives a stable display, but a very odd result from
xrandr. 

psd at EE:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
   1920x1080     77.00* 
psd at EE:~$ 

Booting new kernels (5.3 onwards?) and no "nomodeset" gives either a blank
screen or a very unstable screen with lots of pixelation and a high risk of
going black.  Here is something that I captured earlier: 

psd at EE:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected primary (normal left inverted right x axis y axis)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 connected 1920x1080+0+0 (normal left inverted right x axis y
axis) 531mm x 298mm
   1920x1080     60.00*+
   1680x1050     60.00
   1280x1024     60.02
   1440x900      59.89
   1280x800      59.81
   1152x864      75.00
   1280x720      60.00
   1024x768      70.07    60.00
   800x600       60.32    56.25
   640x480       66.67    59.94
   720x400       70.08
psd at EE:~$ 

"DisplayPort-1" is actually a VGA port.  I believe that there is a conversion
chop on the motherboard, an ASROCK B450 Pro4. 

Give me some time to swap hardware again.

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