Public bug reported: I first changed the backlight by hotkey and writing /sys/class/backlight/brightness file. But the actual brightness wasn't changed.
I reboot my laptop and can't found any files in /sys/class/backlight/, and control bar of brightness disappear. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.10.0-33-generic 4.10.0-33.37~16.04.1 ProcVersionSignature: Ubuntu 4.10.0-33.37~16.04.1-generic 4.10.17 Uname: Linux 4.10.0-33-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.10 Architecture: amd64 CurrentDesktop: Unity Date: Fri Sep 1 01:30:43 2017 InstallationDate: Installed on 2017-08-31 (0 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2) SourcePackage: linux-hwe UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-hwe (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1714316 Title: can't change backlight and /sys/class/backlight empty To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1714316/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs