Verified again on 201208-11466 with 12.04.2 (3.5.0-23 / 3.5.0-27 / 3.5.0-44) it seems that the "unpredictable" brightness level change was caused by the slow response to brightness control of this system.
Also, it works fine on 3.5.0-44 Therefore, I will mark this bug as Invalid Thanks! ** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1174618 Title: [HP Pavilion Sleekbook 14] Brightness control key doesn't work properly. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1174618/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs