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I have 2/3 monitor setup

nr #1 - 5120x2160 (21:9) AKA "5K"

nr #2 - 1920x1080 (16:9)

nr #3 - 1920x1080 (16:9) - connected and used only occasionally

display setup

It`s messy. Default resolution detected by system for #1 is 3440x1440. After switching to the full native resolution of "5K" it looks way better but UI elements and text are uncomfortably small.

When I change scaling for #1, #2 is changing as well :/ Also, I'm glad to see Fractional Scaling build in Gnome Display Settings but it's buggy in my case:

#1 set to 150% scaling - as you can see in this screenshot (although it doesn't reflect the problem 100%) its messed up. On #2 I can go only to half the height of the screen where the top bar is being displayed. Wallpaper is messed up. It's unusable.

Wayland is unavailable for me since I use Nvidia GPU. I wouldn't like to lower my resolution on #1 as a workaround.


So my question is:

How to set up #1 to 200% while keeping #2 (and #3 at some occasions) at 100%.

6
  • It is not working as it should. You could try using Wayland instead of the old Xorg: that may work better with modern setups using different monitors with different resolution. On the log in screen, click the cog to choose the Wayland Ubuntu session. You can always return to Xorg later using the same procedure.
    – vanadium
    May 13, 2020 at 8:35
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    @vanadium 1. I don't see Wayland, instead, I have Gnome Classic or Ubuntu to choose. Apparently, if I'm using an Nvidia GPU (which I use) - Wayland is not avayilable for me (cause of closed source drivers :( ) Gnome Classic didn't help :( Same scaling problem and way uglier ;p
    – ayahuascan
    May 13, 2020 at 9:06
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    did you manage to find a solution to this? Jul 10, 2020 at 7:33
  • @tocallaghan sadly no. I had to turn my resolution down so the scaling could be same on both displays.
    – ayahuascan
    Jul 17, 2020 at 11:25
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    This has been going on for so long, why they haven't fixed it, I don't know, but it makes me not want to use Ubuntu anymore. Sep 12, 2020 at 1:33

2 Answers 2

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I solved this question simply installing gdm3 and choosing this display manager instead of lightdm which was the default installation of ubuntu session on 20.04 release. Now it is possible choose different ad fractional scaling on multiple monitors (eg. native 1920x1080 and 3840x2160 on auxiliary monitor)

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On my Dell XPS 9560 monitor ports are wired to Intel HD Graphics 630. When my primary renderer is Mesa Intel...KBL GT2, Gnome display composition, layout, sizing / works great.

When I switched my prmary renderer to be Nvidia... Things went south. To make long story short - keep your Nvidia Prime setting to ondemand. And your displays will work great, while your nvidia will be busy when need be.

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