Reverse prime is not working properly withxrandr --scale 2x2 on the HDMI output. It only fills one quarter of the screen. However, as you can see on the attached photo, the mouse is visible outside the rendered area and can be moved around. I have tested in Plasma and i3 and there is no difference.
This to compensate for the fact that my laptop monitor is 4K, while the displays are 1920x1080.
Additionally I have an issue with nvidia-settings, upon running it gives the following error message
ERROR: nvidia-settings could not find the registry key file. This file should have been installed a
application profiles will continue to work, but values cannot be prepopulated or validated,
The files nvidia-application-profiles-450.57-key-documentation nvidia-application-profiles-450.57-rc are present in /usr/share/nvidia. When nvidia settings launches it looks like this, missing all the xorg related settings:
Thanks for getting back. Don’t hesitate to reach out if you require any more information that could potentially help you resolve the issue (logs etc.).
$ uname -a
Linux koln 5.8.0-44-generic #50~20.04.1-Ubuntu SMP Wed Feb 10 21:07:30 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ xrandr
Screen 0: minimum 8 x 8, current 7680 x 2400, maximum 32767 x 32767
eDP-1-1 connected 3840x2400+0+0 (normal left inverted right x axis y axis) 336mm x 210mm
3840x2400 59.99*+ 48.00
3840x2160 60.00 60.01 59.98 59.97
3200x1800 59.96 59.94
2880x1620 59.96 59.97
2560x1600 59.99 59.97
2560x1440 59.99 59.99 59.96 59.95
2048x1536 60.00
1920x1440 60.00
...
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 disconnected (normal left inverted right x axis y axis)
DP-1-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-1-3 connected 3840x2400+3840+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95*+
1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1600x1200 60.00
1280x1024 75.02 60.02
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08