[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 #9 from Peter D. <peter_s_d at fastmail.com.au> ---
All three ports work.  

If my computer boots to a blank screen, plugging in a second monitor "resets"
the video and both screens display the desktop as clones.  

There are two monitors; a slow one with a maximum vertical refresh rate of 75
Hz, and a fast one with a maximum vertical refresh rate of 144 Hz.  The fast
monitor has DP, HDMI and VGA ports.  The slow monitor has VGA and DVI ports. 
The motherboard has DP, HDMI, and VGA ports.  Currently there are cables that
can reach ... 
MoBo DP fast monitor
Mobo HDMI (passive adapter) DVI slow monitor
Mobo VGA slow monitor
This can be rearranged if need be.

The reset trick has happened with; 
the slow monitor plugged into the VGA port and being revived when the fast
monitor was plugged into the DP, and with 
the fast monitor plugged into the DP and being revived when the slow monitor
was plugged into the HDMI port.

Currently using a mainline kernel downloaded from Ubuntu. 

psd at EE:~$ uname -a
Linux EE 5.4.0-050400rc7-generic #201911102031 SMP Mon Nov 11 01:34:23 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
psd at EE:~$

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