You have been subscribed to a public bug:
On the regular Ubuntu desktop I use an .xprofile with xrandr commands
that add the monitors native resolution as follows:
xrandr --newmode "3440x1440" 196.25 3440 3600 3952 4464 1440 1443 1453 1468
-hsync +vsync
xrandr --addmode HDMI-1 "3440x1440"
Unfortunately this doesn't work under wayland and I have not yet found a
solution. I have tried several ideas including a custom edid bin file
without success.
I'm reporting against the gnome-control-center since this corresponds to
the end user experience.
ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: gnome-control-center 1:3.32.1-1ubuntu4
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 20 18:21:23 2019
InstallationDate: Installed on 2018-08-25 (238 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux (Ubuntu)
Importance: Low
Status: New
** Tags: amd64 apport-bug disco
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Cannot set 3440x1440 resolution for HP 34C external monitor (HDMI) on
ubuntu-wayland
https://bugs.launchpad.net/bugs/1825665
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