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 Bugs, which is subscribed to 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 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
