Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I would like to disable the automatic screen dimming when I plug in our out my power adapter. Every time my laptop switches between battery/ac, my screen dims even though I have disabled it in every place I could think of.

gnome-power-manager does not seem to be involved, as killing it makes no difference. However, here are some of my settings:

In my gconf, under the key /apps/gnome-power-manager/backlight, I set:

  • battery_reduce: false
  • enable: false
  • brightness_ac: 100
  • brightness_battery: 100
  • brightness_dim_battery: 100
  • idle_dim_time: 3600

Even under /apps/gnome-power-manager/lowpower, I unticked all options.

Where else can I control screen dimming?

share|improve this question
Are you sure it's not a hardware thing? My Thinkpad also dims on power disconnect, even before any operating system is loaded. – scai Aug 24 '12 at 18:35
@scai My thought exactly. It's likely to be a BIOS setting. – StarNamer Aug 24 '12 at 21:40
If it's a hardware issue it should be OS independent. Have you tried a different kernel/distro/OS? – siebz0r Sep 24 '12 at 13:41

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.