Brightness resets to full when on/off battery

[Ryan Finnie]

In yakkety, when my ThinkPad X250 goes on or off battery, the screen is reset to full brightness. Xenial and before did not have this problem. I have not found any other instances which trigger this (lid close, etc).

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: gnome-power-manager 3.22.0-1ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-28.30-generic 4.8.6
Uname: Linux 4.8.0-28-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Dec 2 22:16:21 2016
InstallationDate: Installed on 2015-03-07 (637 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: gnome-power-manager
UpgradeStatus: Upgraded to yakkety on 2016-12-01 (1 days ago)

[Sebastien Bacher (seb128)]

Thank you for your bug report. That's more likely to be a kernel issue than a desktop one though, gnome-power-manager is only including a frontend to see battery stats nowadays. Is there any chance you could try with a xenial kernel to see if that works better?

Otherwise the desktop component handling screen settings is unity-settings-daemon but that codebase didn't change much in recent cycles... note that level changing when disc/connecting from/to a/c is an old issue though it could depends of the driver.

Unassigning the desktop team since that doesn't seem like an high priority issue nor a desktop regression.

[Launchpad Janitor (janitor)]

[Expired for gnome-power-manager (Ubuntu) because there has been no activity for 60 days.]