"Show on" setting does nothing in dual-monitor setup

[Maximilian Federle]

I have two identical monitors that appear with the same name in settings: Dell Inc. 25"

In the appearance settings I have three options for "Show on":

- All displays
- Dell Inc. 25"
- Dell Inc. 25"

If I want to restrict the dock to one monitor only by switch from "All displays" to either one of the two "Dell Inc. 25"", nothing changes; the dock is still shown on both monitors.

Gnome-shell itself has no problems differentiating both monitors and displays its top-panel only on the primary one.

Ubuntu 20.04 fully updated
Nvidia + XOrg
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2016-11-08 (1262 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
Package: gnome-shell-extension-ubuntu-dock 67ubuntu20.04.5
PackageArchitecture: all
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Tags: focal
Uname: Linux 5.4.0-26-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-04-06 (18 days ago)
UserGroups: adm cdrom dialout dip disk lp lpadmin lxd plugdev sambashare sudo vboxusers
_MarkForUpload: True

[Maximilian Federle (ppd)]

apport information

[Maximilian Federle (ppd)]

apport information

[Maximilian Federle (ppd)]

apport information

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1866088, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.