Speaking of the futility of reporting bugs, check out the 1322588. Basically, gdm tries to adjust the screen brightness when a user is already logged in on that screen (fortunately, it fails). Fedora users report the bug, the maintainer asks them to report it upstream. They report it upstream. The upstream tinkers with something tangentially related, closes the bug. Maintainer closes the bug in Fedora. The issue is not fixed, users re-open the bug and the process continues. It was going on for coming up to 2 years now. I don't know why the GNOME upstream cannot program gdm not to screw with the screen after the very same gdm has logged a user in. It's beyond stupid, and I don't know what can be done. I can buy a Mac, I suppose.
-- Comment #71 from Cédric Bellegarde Simple workaround: - Disable auto brightness in your gnome session - Logout and stop gdm - Copy ~/.config/dconf/user to /var/lib/gdm/.config/dconf/user
-- Comment #75 from Bastien Nocera Maybe you can do something there, instead of posting passive aggressive blog entries.
Back when Bastien maintained xine, we enjoyed a cordial working relationship, but I guess that does not count for anything.