Script and instructions to get fractional display scaling working nicely on Linux distros using X11 (i.e. X.Org).

Many people are having issues with high (arguably medium) resolution screens and Linux. Some distros only have hidden settings, some only have integer scaling (x2, 4x), some have fractional scaling but it's garbage.

This technique uses an (I think) X11-specific workaround with xrandr to make everything a comfortable size. It sets scaling to 2x, making everything massive, and then shrinks it back down again to 1.5x or whatever you want by "zooming out". It was originally written for Ubuntu 17.10. It should work for any Linux distro with an X11 display server, but might need tweaking for not-Ubuntu or not-Gnome.

1. Download display_scale.sh and put it somewhere like your documents folder.

2. If you're not sure what display server's running:

   $ echo $XDG_SESSION_TYPE
   

3. If you're on Wayland on Ubuntu it's easy to switch to X11. Open up this config file with whatever text editor.

   $ sudo nano /etc/gdm3/custom.conf
   

   and remove the '#' that comments out this line:

   #WaylandEnable=false
   

   If you can't find that file, try looking in /etc/gdm/

4. Get X11 up by re-loging-in or ALT+F2 then r then enter.

5. Set Gnomes display scaling to 2x. This makes everything really big.

   $ gsettings set org.gnome.desktop.interface scaling-factor 2
   

6. Run display_scale.sh. Try different sizes with the number at the end. 1 is what you have right now (big), 2 is the same size you had before setting 2x display scaling in the last step (but at 2x render scale so it'll look fancier and use more resources).

   $ ./Documents/display_scale.sh 1.5
   

7. Get the script running at startup. In Ubuntu it's easiest with 'Startup Application Preferences'. In the command text field put in this, with the number you decided upon earlier (or none if you're happy with 1.5x):

   /home/your-username/Documents/display_scale.sh
   

When I (burntcustard) open my laptop lid (not when I suspend, reboot, or close the lid... literally when it opens), scaling breaks.

display_scale_fix.sh runs display_scale.sh twice, first to set it to 1, and then whatever number you specify. It's helping me out for now, but I hope there's a better way someone can find, or it automagically gets fixed. I have the script set to a keyboard shortcut with the command:

bash /home/your-username/Documents/display_scale_fix.sh

a) That requires some fiddling to figure out what the name of the display is.

b) That needs some calculatoring to try out different panning numbers.

c) Ain't nobody got time for dat.

If you're determined you want to do >2 (be warned, larger scales use exponentially more resources), you need to redo step 4 and set the org.gnome.desktop.interface scaling factor to 4 or 8.

Short answer: No.

Long answer: No, the script won't work, but if you look inside it, you should be able to figure out what it's doing and might be able to apply similar techniques with multiple screens. However... you're likely better off waiting until Waylands scaling has been improved, or dare I say it... use Win10 or OS X because they have much better multi-display scaling options.

X.Org is a display server that implements the ancient X11 display server protocol. For more info: https://en.wikipedia.org/wiki/Display_server#X11