I can confirm this on a Ubuntu 12.04 64-bit after upgrade from 11.10.
When the Brightness and Lock tool is started from command line it
produces the following output:
$ gnome-control-center screen
(gnome-control-center:4353): screen-cc-panel-WARNING **: Error getting
brightness:
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gsd_5fpower_5fmanager_5ferror.Code0:
gsd-backlight-helper failed:
Also, the /sys/class/backlight/ directory is empty.
Is there a way to fix this?
** Summary changed:
- Missing brightness control in setting /Brightness and lock
+ Missing brightness control in System Settings/Brightness and Lock
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https://bugs.launchpad.net/bugs/999888
Title:
Missing brightness control in System Settings/Brightness and Lock
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