Might this be upstream kernel issue : https://bugzilla.kernel.org/show_bug.cgi?id=63931 ?
** Bug watch added: Linux Kernel Bug Tracker #63931 http://bugzilla.kernel.org/show_bug.cgi?id=63931 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
