Originally Posted by
itzdk
When I first boot up its running at 656x416 on my 4K monitor. In the display settings there weren't any other options. I found bits of info on various blog posts and tried to use:
cvt 1920 1080 60
which returned
Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
After that I used xrandr to create a new mode
xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
Which returned the error
xrandr: Failed to get size of gamma for output default
But I saw some people mention that this error was harmless so I continued. Using xrandr at this point I could see my new mode in the list. I added the mode
xrandr --addmode default "1920x1080_60.00"
which gave that same error again. But this time in the screen settings I could see the new resolution option. But when clicking and applying this resolution nothing happened. I then tried to set the size with xrandr
xrandr -s "1920x1080_60.00"
and even with sudo I kept getting the same error
Failed to change the screen configuration!
I tried to restart after doing this, but after restarting I couldnt see my new mode in xrandr or in the system settings. Does anyone know how to fix this?