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I've got an Ubuntu 20.04 workstation, featuring an NVidia RTX2080 gpu, and connected to a widescreen with a native resolution of 3440x1440.

For basic needs, the display works fine : by default, it's running at native 3440x1440.

But if I go into Settings->Display and try to select an alternate resolution, the choice is scarce, limited to 3440x1440, 1024x768 and 800x600. That's it. No other intermediate resolution is proposed.

It happens that I need to test such intermediate resolutions, like 1920x1080, but can't do it on this station.

However, when running a full-screen game which offers a choice of resolution on the same computer, a ton of choices are offered, and they all work great, indicating that there is no issue with neither the display, nor the gpu, nor the driver. Hence, it seems a limitation of Settings->Display.

I've tested multiple driver versions, they all feature the same (currently running 460.32.03).

Has anyone met the same kind of issue ? Is there a solution for it ?

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1 Answer 1

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You should be able to manually add resolutions using cvt and xrandr if you are sure your graphics and monitor support the modes. See my recent post here and the link there:

Can't set the native resolution for an external VGA 1080p monitor with xrandr or settings

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  • I've actually already read your answer and tried it ! Unfortunately, it failed : xrandr returned a bunch of errors, as if many entries coming from cvt were wrong, and it looked scary enough that I did not dare attempting more, due to a perceived risk of breaking desktop settings.
    – Cyan
    Jan 26, 2021 at 1:56
  • Actually tried it again, and got this result : ``` X Error of failed request: BadName (named color or font does not exist) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 16 (RRCreateMode) Serial number of failed request: 43 Current serial number in output stream: 43 ```
    – Cyan
    Jan 26, 2021 at 2:03
  • Nope, actually this was a new error due to previous cvt mode being still around. The actual error I got when trying to apply the new mode with --addmode : X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 140 (RANDR) Minor opcode of failed request: 18 (RRAddOutputMode) Serial number of failed request: 43 Current serial number in output stream: 44
    – Cyan
    Jan 26, 2021 at 2:33
  • I suggest you update your original question with exactly the command lines you are issuing.
    – codlord
    Jan 26, 2021 at 11:40

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