So comparing this laptop running Ubuntu 26.04 to another running 24.04, changing the brightness settings at the GDM greeter on both causes that brightness to apply to the user session that logs in. I suppose it makes sense that display brightness isn't the same as any other personal preference, since you can potentially use multiple displays or switch displays during your session.
So the main difference -- and the source of my annoyance -- is that the GDM session had the automatic screen brightness enabled in its configuration. I didn't see a way to turn the ambient light sensor off in the BIOS. I saw Daniel's message regarding copying personal dconf settings, but I wanted to try resolving this problem in a less heavy-handed way. I created a dconf profile config for GDM: ``` # /etc/dconf/profile/gdm user-db:user system-db:gdm file-db:/usr/share/gdm/greeter-dconf-defaults ``` Then I created system-wide setting turning off autoomatic brightness for GDM: ``` # /etc/dconf/db/gdm.d/99-brightness [org/gnome/settings-daemon/plugins/power] ambient-enabled=false ``` Then I ran `sudo dconf update` and rebooted my machine. On restart, GDM is running, and it's no longer automatically switching the display brightness (at least as far as I can tell). I'm not sure if this is the correct method for doing what I want. It seems to work, at least. It's a little irritating that I have to do this via config files and command line interaction, but it sounds like there's a long-standing feature request for this with upstream already. Unless there's some downside with the approach that I took, we can probably close this out. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2147357 Title: Brightness settings from GNOME login manager override GNOME session brightness settings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/2147357/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
