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I have currently two monitors : 

Screen 0: minimum 8 x 8, current 6400 x 2160, maximum 32767 x 32767
DP-2 connected primary 3840x2160+2560+0 (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     60.00*+  30.00  
   2560x1440     59.95  
   1920x1080     60.00    59.94  
   1600x900      60.00  
   1280x1024     60.02  
   1280x800      59.81  
   1280x720      60.00    59.94  
   1152x864      59.96  
   1024x768      60.00  
   800x600       60.32  
   720x480       59.94  
   640x480       59.94    59.93  
DP-4 connected 2560x1440+0+360 (normal left inverted right x axis y axis) 598mm x 336mm
   2560x1440     59.95*+ 165.00   144.00   120.00    99.95    84.98    23.97  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94

My problem is, tha the 4k one (DP-2) is way to small. If I increase the scaling, then the DP-4 is way too big.

I saw other posts that told that the multiple scaling is possible in wayland but since I have a nvidia there were no drivers currently...

I also tried some commands with xrandr but none worked for exemple : 

xrandr --output DP-4 --scale 2x2 --pos 7680x0; xrandr --output DP-2 --scale 1x1 --mode 3840x2160  -fb 8960x5040  --pos 0x0

I'm running Ubuntu 18.04 with Gnome 3.38.2. Are there currently a solution to this ?

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3
  • It is hard to achieve using xorg, but if you try wayland, it works from the settings. Nvidia cards not supported though, afaik
    – Кристиян Кацаров
    Mar 30, 2020 at 8:01
  • Are you mirroring the primary screen? Or created second workspace on second monitor?
    – Kulfy
    Apr 2, 2020 at 19:08
  • have you already tried this? askubuntu.com/a/555812/839631
    – user839631
    Apr 4, 2020 at 8:20

2 Answers 2

Reset to default
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It should be possible. I have not tried doing this with xrandr directly. I used the Display Settings. I am on xUbuntu, and for me its Menu->Settings->Display enter image description here

The Iiyama is set to 1920x1080, whilst the Dell is 1280x1024 (I normally have them the same, I just changed them for you!) enter image description here

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2
  • Your monitors have approximativly the same scale, thats why this is working fine.
    – Dimitri Danilov
    Apr 3, 2020 at 8:00
  • Where in your screenshot of the "Display" window would you change the scale?
    – Andrew
    Apr 6, 2020 at 6:05
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What you want is Display independent DPI scaling. Which automatically change size of windows depending on the the screen they are on.

This isn't a supported in Xorg. But one of the main benefits of Using Wayland which is the long awaited successor to Xorg.

Ubuntu hasn't yet changed it to the default so you have to select it from the login screen like this:

enter image description here

All Xorg applications need to add Wayland support for the DPI scaling to work. So it wont work for all programs.

Legacy applications will not scale up / down on different screens as they are running in a rootless Xorg under Wayland.

All gnome application work so you can try with files or terminal. Firefox also support Wayland natively.

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