Me too with a Dell Vostro 1500. I've found a workaround by going to System > Preferences > Power Management and moving the brightness slider, which then "resets" the brightness so I can move the slider to my desired brightness level.
-- Cannot increase display brightness with hotkeys https://bugs.launchpad.net/bugs/140839 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs