You have been subscribed to a public bug:
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 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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can't change backlight and /sys/class/backlight empty
https://bugs.launchpad.net/bugs/1714316
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