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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Blank display on Ubuntu 19.10 on Ryzen 3 2200G and Ryzen 5 2400G APUs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112288#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Blank display on Ubuntu 19.10 on Ryzen 3 2200G and Ryzen 5 2400G APUs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112288">bug 112288</a>
from <span class="vcard"><a class="email" href="mailto:peter_s_d@fastmail.com.au" title="Peter D. <peter_s_d@fastmail.com.au>"> <span class="fn">Peter D.</span></a>
</span></b>
<pre>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@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@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@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@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.</pre>
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