Friday, August 3, 2012

Re-enable Screen Brightness Controls on Acer Aspire One (Ubuntu)

There appears to be a problem with some computers and Ubuntu-based distributions (verified on Linux Mint 13 and Lubuntu 12.10) where you can't adjust the screen brightness. This only applies if the brightness controls pop up and appear to work, but the brightness does not actually change - it's stuck at full-bright. If you aren't seeing the brightness popup, that's a different problem.

Here is how I re-enabled brightness controls on my Acer Aspire One.

gksudo gedit /etc/default/grub

Find this line:


Change it to this:


Save changes and update Grub:

sudo update-grub


After doing this, I can fade all the way to black. Great for battery life! Hard to read though.


  1. Perfect fix! Nice Job with the info. Appreciated greatly by this happy reader, thank you!

    Worked perfect on Gateway NV56R14u.

  2. Excellent fix. Thank you. Works for my Gateway NE56r31u.