Binary package hint: xfce4-power-manager
Hovering over the icon I get a "No device found" tooltip and no control seems possible. I can, however, successfully control my backlight level directly through sysfs like this:
echo 15 >/sys/class/backlight/acpi_video0/brightness
This is on a Thinkpad X120e machine. I had a quick look at the Ubuntu package changelog and the source - it seems like we enable PolicyKit support (at least there is a libpolkit-gobject-1-dev build depencency), but xfpm-power-backlight-helper doesn't get build or installed?
It would of course be better if this machine would allow for changing the brightness through Xrandr, but unfortunately this does not seem to be the case (following up on this one).
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xfce4-power-manager-plugins 1.0.10-1
Uname: Linux 2.6.39-rc3-gohai+ x86_64
Architecture: amd64
Date: Fri Apr 15 11:43:37 2011
InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: xfce4-power-manager
UpgradeStatus: No upgrade log present (probably fresh install)
Response from Alex Deucher:
"The radeon driver has never handled the backlight control. It's handled by acpi. xfce should use sysfs."
(https:/
Would be nice if the code/helper for controlling the backlight through sysfs could be enabled for xfce4-power-