You have been subscribed to a public bug:
When you press the hotkey to adjust the screen brightness, the
brightness level indicator will change accordingly, but the actual
brightness does not.
And from watching the brightness file in
/sys/class/backlight/amdgpu_bl0, when the brightness control hotkey was
pressed, it will change the value here (1~255).
$ ls /sys/class/backlight/
amdgpu_bl0 intel_backlight
This issue existed since 16.04.2 + 4.8 HWE kernel.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.10.0-27-generic 4.10.0-27.30~16.04.2
ProcVersionSignature: Ubuntu 4.10.0-27.30~16.04.2-generic 4.10.17
Uname: Linux 4.10.0-27-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.9
Architecture: amd64
Date: Thu Jul 6 06:37:41 2017
InstallationDate: Installed on 2017-07-06 (0 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170209)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug package-from-proposed xenial
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[Dell Precision 7720] Unable to change brightness on this I+A laptop
https://bugs.launchpad.net/bugs/1702666
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