[DisplayLink] Settings for multiple displays do not persist

[bartgenuit]

Hi, I'd like to report the following bug. I'm trying to setup multiple displays, but whatever settings I try to set, after pressing 'Apply' and 'Keep Settings', they revert back to the previous settings.

I have one built-in laptop display (D1) and one external display (D2), connected via a USB-C dock using DisplayLink and HDMI. Display Mode is set to 'Join Displays'.

It seems whatever settings I change, they don't persist. I tried the following settings:
- Change the primary display from (D1) to (D2). Reverts back to (D1) being the primary.
- Change the order of the displays to match my physical setup (D2 on the left, D1 on the right). Reverts back to D1 on the left, D2 on the right.
- Change the order of the displays putting D1 on top of D2. Reverts back to D1 on the left, D2 on the right.
- Change the refresh rate of D2 from 60 Hz to 50 Hz. Reverts back to 60 Hz.

If you need any further information, please let me know.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.5-0ubuntu3
ProcVersionSignature: Ubuntu 5.11.0-37.41~20.04.2-generic 5.11.22
Uname: Linux 5.11.0-37-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Sep 30 22:27:20 2021
InstallationDate: Installed on 2021-09-28 (2 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

[bartgenuit (bartgenuit)]

Interestingly, the problem disappears when using Xorg, so it seems to be only with Wayland.