The latest g-p-m fixed this for me - the buttons work correctly and the brightness level does not get reset after some time.
-- Screen brightness resets to default (maximum) on idle with AC plugged in https://bugs.launchpad.net/bugs/137598 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
