OK, here's output from xev. I pressed the increase brightness combination twice, and decrease combination once. It seems that the first increase resulted in one even but all further presses resulted in two events:
MappingNotify event, serial 40, synthetic NO, window 0x0, request MappingKeyboard, first_keycode 8, count 248 MappingNotify event, serial 41, synthetic NO, window 0x0, request MappingKeyboard, first_keycode 8, count 248 MappingNotify event, serial 42, synthetic NO, window 0x0, request MappingKeyboard, first_keycode 8, count 248 MappingNotify event, serial 43, synthetic NO, window 0x0, request MappingKeyboard, first_keycode 8, count 248 MappingNotify event, serial 44, synthetic NO, window 0x0, request MappingKeyboard, first_keycode 8, count 248 HTH -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1069357 Title: Hardware keys change backlight brightness in much larger increments/steps than expected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1069357/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs