Comment # 8
on bug 112288
from Peter D.
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.
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