Public bug reported:

I am running Ubuntu 19.04 with an AMD RX570, using the open source
driver, and I have two Dell U2415 monitors connected via DisplayPort
(not daisy-chained).  Gnome Night Light only changes the color on the
monitor dubbed "Monitor 1" in display settings (though the monitor I
have set to primary is Monitor 2).  I found a multiple posts where it
was stated that using `killall gsd-color` fixed the issue.  This
workaround was successful for me also.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: gnome (not installed)
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: Tue Apr 30 20:05:24 2019
InstallationDate: Installed on 2019-03-19 (42 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: meta-gnome3
UpgradeStatus: Upgraded to disco on 2019-04-19 (12 days ago)

** Affects: meta-gnome3 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco wayland-session

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https://bugs.launchpad.net/bugs/1827160

Title:
  gnome night light works on only one monitor

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