Screen brightness is not changing on my ACER 5742 notebook. I have Ubuntu 10.10 installed inside Windows 7 OS. Hotkeys are used for changing brightness. Though, a bar displaying brightness level appears on screen but there is no actual change in brightness of screen.
This worked for me. Run:
Change the line:
Make it say this instead:
Modifying both these lines in
I had the same problem with my Acer 5749. The bar displaying the brightness would show that the brightness was moving up and down, but the actual brightness wasn't changing.
But it didn't work. Then I tried:
and that did work.
In both cases I edited the lines in
Another way, by editing just one line:
Finally I tried just:
and that worked too. I put the other line back to how it was originally and the brightness control still works after running