screen dimmed after suspend

[veddox]

Often, waking the computer up from suspend will cause the screen brightness to be set right down (was 100% before suspend, becomes ~ 20% after waking). This happens during 40-70% of all suspends. I have not yet been able to figure out any correlations with previous activity, so the behaviour seems random.

(I assume this is a LightDM problem, because it first manifests itself in the login screen, but I'm not sure.)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.3-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24
Uname: Linux 4.4.0-47-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Nov 13 15:39:26 2016
InstallationDate: Installed on 2016-07-15 (120 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)