Thanks for the advice. I installed 4.7.0-040700.201608021801 and it doesn't make any difference.
I did discover, though, that with either kernel, if you give intel_backlight a brightness of 0, the backlight switches off completely. ** 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/1608745 Title: Backlight uncontrollable on Samsung NP740UE3 since upgrade to Xenial To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1608745/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs