Public bug reported:
Binary package hint: gnome-power-manager
When gnome-power-manager is set to dim the display on battery power,
brightness applet "double counts" gnome's battery screen dimming
setting. If the AC screen brightness is set to 100%, and the battery
dimming is set to 20%, then brightness applet presents a slider that
allows the brightness to be adjusted between 0% and 80%. It then reads
the current screen brightness (say 80%), and sets the slider position to
80%, dimming the screen by another 20%. It does this each time it
displays the slider widget.
It would be better if it always presented the full brightness range.
(So that it would behave consistently with the fn-? key combinations)
Otherwise, there is no way to use it to "un-dim" the screen when the
laptop is on battery.
This problem is related to bug 141466 (was that fixed upstream? gutsy
has the same behavior...); gnome seems to have a concept of screen
brightness and a dimming factor, which leads to all sorts of confusion.
If it had a single value (just for brightness), then the battery mode
screen dimming slider could be a battery mode screen brightness
slider...
This would probably also simplify the fixes for the following bugs:
128452 (if it's due to rounding discrepancies when the brightness factor
is multiplied by the dimming factor) and 140018 (what does it mean to
sync the g-p-m settings with changes made with fn-fx key presses when
you have the dimming factor?)
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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brightness applet cannot override battery dimming
https://bugs.launchpad.net/bugs/155121
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