I know this issue is annoying but it's also a feature and not a bug. To turn it off (after you have logged in) go to:
Settings > Power > Power Saving > Automatic Brightness = OFF ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1938477 Title: Screen brightness changing randomly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1938477/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp