http://askubuntu.com/questions/21523/screen-brightness-not-changing-on-acer-5742-notebook this solution worked for me.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/764195 Title: laptop screen blacklight brightness always at 100% (even on battery), can't be lowered -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
