I confirm that on my Dell XPS 13 night light does not work in Waylay session. All is OK in with XOrg. I'm using Ubuntu 19.10, new installation.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1798840 Title: Night Light is not functioning Status in gnome-control-center package in Ubuntu: Expired Status in gnome-shell package in Ubuntu: New Bug description: Night Light is not shading/filtering the screen anymore after the update to Cosmic (Ubuntu 18.10) from Bionic (Ubuntu 18.04 LTS). It still appears as an option and all the settings work, but the feature itself isn't filtering out blue light from the screen. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: gnome-control-center 1:3.30.1-1ubuntu2 ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12 Uname: Linux 4.18.0-10-generic x86_64 ApportVersion: 2.20.10-0ubuntu13 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Fri Oct 19 11:03:28 2018 InstallationDate: Installed on 2018-08-17 (63 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gnome-control-center UpgradeStatus: Upgraded to cosmic on 2018-10-19 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1798840/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp