It started happening when I switched to Gnome. At first I had both Gnome and Unity next to each other and when I logged in to Unity, I could still change the backlight normally. It only doesn't work under Gnome strangely.
I've tested the new kernel, but it had no effect: Linux 4.8.0-040800rc6-generic #201609121119 SMP Mon Sep 12 15:21:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux ** Tags added: kernel-bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624234 Title: Changing backlight doesn't work in Gnome To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1624234/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs