I have a laptop with AMD Ryzen 2500u, Vega 8 graphics card. I installed Ubuntu 19.04 with GNOME. But my issue is that I can't change the screen resolution from my current (1920x1080) to any other one, or I'll get a black screen.
This is the output of xrandr:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1920x1080 60.01*+ 60.01 59.97 59.96 59.93 47.10 1680x1050 60.01 59.95 59.88 1600x1024 60.17 1400x1050 59.98 1600x900 59.99 59.94 59.95 59.82 1280x1024 60.01 60.02 1440x900 60.01 59.89 1400x900 59.96 59.88 1280x960 60.00 1440x810 60.00 59.97 1368x768 59.88 59.85 1360x768 59.80 59.96 1280x800 59.99 60.01 59.97 59.81 59.91 1152x864 60.00 1280x720 60.00 60.01 59.99 59.86 59.74 1024x768 60.01 60.04 60.00 960x720 60.00 928x696 60.05 896x672 60.01 1024x576 59.95 59.96 59.90 59.82 960x600 59.93 60.00 960x540 59.96 59.99 59.63 59.82 800x600 60.01 60.00 60.32 56.25 840x525 60.01 59.88 864x486 59.92 59.57 800x512 60.17 700x525 59.98 800x450 59.95 59.82 640x512 60.02 720x450 59.89 700x450 59.96 59.88 640x480 60.01 60.00 59.94 720x405 59.51 58.99 684x384 59.88 59.85 680x384 59.80 59.96 640x400 59.88 59.98 576x432 60.06 640x360 59.86 59.83 59.84 59.32 512x384 60.00 512x288 60.00 59.92 480x270 59.63 59.82 400x300 60.32 56.34 432x243 59.92 59.57 320x240 60.05 360x202 59.51 59.13 320x180 59.84 59.32 I tried other desktop environments such as Xfce/Cinnamon.. But no luck.
Any help?
1 Answer
I had this issue too (or an issue very similar to this) on my new T495 although I can't say for sure whether my solution will work on Ubuntu as I am using Fedora 31 KDE.
By default it seems to use the amdgpu driver built into the kernel and then when X is started it uses the modesetting xorg driver. To rectify the issue, I instead used the amdgpu DDX driver for xorg. On Fedora, the package for this is xorg-x11-drv-amdgpu. As I don't use Ubuntu I'm not 100% sure what the package is on that (a quick google suggests xserver-xorg-video-amdgpu). My xrandr output looked much like yours before with the modesetting driver, now though (with the DDX driver) it looks like this:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm 1920x1080 60.00*+ 1680x1050 60.00 1280x1024 60.00 1440x900 60.00 1280x800 60.00 1280x720 60.00 1024x768 60.00 800x600 60.00 640x480 60.00
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)As a side note, I was also unable to recover from suspending when using the (default) modesetting driver and the only way to recover was to reset the machine. On reboot there was an error in the logs referencing dcn10_hw_sequencer.c, however using the DDX driver, I am now able to recover from suspending the machine successfully.
