Screen dims on battery

Asked by Marco Parillo on 2010-09-03

I see an answer to 'Brightness sliders do not appear in power manager using 8.04' at:
I have a similar problem with my Dell using the Live CD with 10.04, but the solution there does not work (probably because a Dell laptop does not have a /sys/devices/platform/dell_laptop directory like the Asus in the resolved question (/sys/devices/platform/asus_laptop/ls_switch)).

The Battery Tab in my Power Management Preferences Menu does not have a slider for screen brightness, and when I <Fn> <up arrow> to manually increase the screen brightness, it promptly dims again very quickly. If the battery is at half-charge, maybe in 30 seconds or less.

What I would like is some way of indicating that I do not mind running the battery down, but instead would prefer to have an experience similar to that when I plug in my Latitude D630.

Many thanks in advance.

Question information

English Edit question
Ubuntu Edit question
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Solved by:
Marc Stewart
Last query:
Last reply:
Best Marc Stewart (marc.stewart) said : #1

That just seems like you've got the "Dim display when idle" option set in the power management preferences. Open them by going to:
System > Preferences > Power Management
then click on the "On Battery Power" tab. The "Dim display when idle" checkbox is at the bottom. Untick it to keep the brightness consistent.

Marco Parillo (marco-parillo) said : #2

It worked great, thanks.

Marco Parillo (marco-parillo) said : #3

Thanks Marc Stewart, that solved my question.