night light stopped working

[FM33]

Same as ​#1752680 but happening from cold boot and won't work again after disabling/re-enabling night light.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.9-0ubuntu0.20.04.2
ProcVersionSignature: Ubuntu 5.15.0-76.83~20.04.1-generic 5.15.99
Uname: Linux 5.15.0-76-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Jun 30 10:25:21 2023
DisplayManager: gdm3
InstallationDate: Installed on 2020-10-24 (978 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.36.9-0ubuntu0.20.04.2
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Thanks for the bug report. Please run:

  lspci -k > lspci.txt
  journalctl -b0 > journal.txt

and attach the resulting text files here.

[FM33 (fm33)]

It's now working again without (known) action (update?). I attach the files anyway in case the problem is back in the future.

[Daniel van Vugt (vanvugt)]

Please uninstall the extension '<email address hidden>' because it seems to be broken, then see if night light works using the normal controls in Settings.

If it still doesn't work after that then it sounds like the problem is:

gnome-shell[1269]: Failed to set CRTC gamma: drmModeCrtcSetGamma on CRTC 51 failed: Permission non accordée

[Daniel van Vugt (vanvugt)]

Actually it sounds like that log message is benign:

https://gitlab.gnome.org/GNOME/mutter/-/issues/1106