BondCreat, the next step is to bisect between Quantal and Raring, in order to identify the commit that caused this problem. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection ?
** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1208257 Title: [HP ProBook 4540s] brightness control problems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs