As chrmhoffmann suggested, this bug may be the same as https://bugs.launchpad.net/ubuntu/+source/linux/+bug/828296
The workaround mentioned there works on my laptop. There is still some delay (0.1s max), but almost unnoticeable! https://bugs.launchpad.net/ubuntu/+source/linux/+bug/828296/comments/5 -- 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
