Unplugging AC power when screen is dimmed interferes with brightness settings
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
gnome-power-manager (Ubuntu) |
Invalid
|
Low
|
Unassigned |
Bug Description
Binary package hint: gnome-power-manager
In gutsy x86_64 on my dell xps m1330 unplugging the ac power when the screen is dimmed because the laptop is idle ruins the power management brightness options.
To reproduce:
select dim screen when idle both in ac and battery panel,
set ac brightness to 100%,
and decrease brightness by 20% when on battery.
Wait with the ac connected for the screen to go dim and then unplug ac: instead of decreasing by 20% brightness will go down considerably (80% less approximately). The dim when idle options won't work anymore.
The workaround is to deselect the dim when idle options, restore the brightness levels, log of, log on again and select the options again.
Similar experiences on Dell Inspiron 6000 using 8.04 x86_32
When "Dim display when Idle" was checked in power management, it would dim it but not return to the correct brightness when i continued to use the laptop.