Public bug reported:
Binary package hint: gnome-power-manager
Starting from AC, unplug the power cable. The display is dimmed to 50%
of the initial level as expected. Change the display brightness. Restore
the AC power. The display brightness level is not restored. Switching
now again to battery mode will further decrease the luminosity to 25% of
the starting value (50% of current level).
Having always a 50% decrease of the brightness from then current value when
switching to battery is sometimes leading to brightness levels too low. For
example if I have the AC power plugged in but I use a 50% brightness because
the environment light is low, turning off AC will lead to a brightness of 25%
which is too low to be able too see anything
on the screen (and to easily find the keys to turn up the brightness).
Perhaps would be better when switching to save the current level and
restore to it rather than to a percentage from the current one. For the
first switch the user can provide the percentages from the maximum
brightness to be used via Power Management Preferences panel. For the
AC mode the user can already set the default display brightness but for
the battery mode the user can only choose to dim it (looks to be 50%
from current level).
My system details:
Description: Ubuntu jaunty (development branch)
Release: 9.04
gnome-power-manager:
Installed: 2.24.2-2ubuntu7
Candidate: 2.24.2-2ubuntu7
Version table:
*** 2.24.2-2ubuntu7 0
500 http://de.archive.ubuntu.com jaunty/main Packages
100 /var/lib/dpkg/status
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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Display brightness dim/restore not consistent on UNR
https://bugs.launchpad.net/bugs/355627
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