Night Light stays on

[Guillaume Michaud]

I have "Night mode" set to turn on every day at 10pm and off at 6 am.
However, at 6, the "Night mode" icon disappears but my screen remaine orangeish as when "Night mode" is on.
Logging off and on again restores color temperature back to normal.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.4-1ubuntu1~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-45.49-generic 5.4.55
Uname: Linux 5.4.0-45-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: GNOME
Date: Mon Sep 7 07:43:43 2020
DisplayManager: gdm3
InstallationDate: Installed on 2020-04-11 (148 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200409)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.36.4-0ubuntu0.20.04.2
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Please run these commands after the problem occurs next:

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

and then attach the resulting text files here.

[Daniel van Vugt (vanvugt)]

Also please try disabling removing these in case they are affecting the issue:

  '<email address hidden>',
  '<email address hidden>'

[Guillaume Michaud (gfmichaud)]

I currently have no Gnome extension activated, apart from "Ubuntu appindicators" (see screenshot "Extensions.png")

[Guillaume Michaud (gfmichaud)]

Extension list (attachment)

[Guillaume Michaud (gfmichaud)]

Night Light is set to turn on at 10:00 pm and off at 6:00 am.
At 7:25 am I noticed the icon had disappeared but the screen was still "orange".
Please find as an attachment the results of:
  lspci -kv > lspci.txt
  journalctl -b0 > journal.txt

[Guillaume Michaud (gfmichaud)]

This may have something to do with using an external screen.
I usually use only my external screen, with laptop screen/lid closed.
I noticed right now that if I open the laptop lid, then color on the external screen goes back to "normal" and color on the laptop screen (defined as secondary, without Gnome shell panel) stays in "orange" mode.

[Daniel van Vugt (vanvugt)]

I wonder if we could generalise this with bug 1772212, assuming mentions of "nvidia" were removed from that. Although that bug might well be Nvidia-specific.

[Daniel van Vugt (vanvugt)]

I think this might happen because the screen is off at 6am. So any attempt to change the gamma ramps (turn off night light) might fail and not be reattempted. That would be easy enough to fix if it was all in the gnome-shell process, but I suspect some of it is happening in the 'colord' or 'gsd-color' processes. Upstream the GNOME developers have expressed a plan to sort that out:

  https://gitlab.gnome.org/GNOME/gnome-settings-daemon/-/issues/131

which might also help with this when done.

[Daniel van Vugt (vanvugt)]

The fix appears to be in mutter 3.36.7, but beware; it's not in 3.37 yet.

[Marco Trevisan (Treviño) (3v1n0)]

The focal part of this bug is linked to bug #1887998 (I didn't include it in the changelog for auto-closing the bug, sorry).

[Marco Trevisan (Treviño) (3v1n0)]

Sorry, I meant bug #1896332

[Launchpad Janitor (janitor)]

This bug was fixed in the package mutter - 3.38.1-1ubuntu1

---------------
mutter (3.38.1-1ubuntu1) groovy; urgency=medium

  * Merge with debian, including new upstream version, remaining changes:
    - debian/gbp.conf: update upstream branch to point to ubuntu/master
    - debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      + X11: Add support for fractional scaling using Randr
  * d/p/clutter-backend-x11-Don-t-set-the-font-dpi-computed-on-X1.patch:
    - Dropped, applied upstream

mutter (3.38.1-1) unstable; urgency=medium

  * New upstream release:
    - Fix Night Light updates after DPMS (LP: #1894596)
    - Fix button scrolling on X11
    - Always use correct font-dpi setting on X11
    - Improve handling of scanout failures
    - Fix middle/right button mixup in scroll button assignment
    - Fix resizing of attached modal dialogs on wayland
    - Enable KMS modifiers on devices that need them
    - Fix IM handling on X11
    - Fix glitches in "undefined" screencast areas
    - Fix visual glitches on background with fractional scaling (LP: #1898080)
    - Fix using correct refresh rate under X11 (LP: #1898645)
    - Misc. bug fixes and cleanups
    - Plugged memory leaks
  * debian/patches: Refresh as per upstream changes
  * debian/mutter-common.install: Include mutter udev rules
  * debian/control: Add udev build-dependency

mutter (3.38.0-2) unstable; urgency=medium

  * Team upload
  * Release to unstable (starts transition: #969321)
  * d/rules: Ignore test failures in flaky tests on all architectures.
    Upstream presumably marked them as flaky for a reason, and they do
    fail on amd64 when under load.
  * Revert "debian/watch: Watch unstable versions"

 -- Marco Trevisan (Treviño) <email address hidden> Sun, 11 Oct 2020 02:13:27 +0200

[Marco Trevisan (Treviño) (3v1n0)]

This was fixed as part of https://launchpad.net/ubuntu/+source/mutter/3.36.7+git20201123-0.20.04.1