I have an Acer Aspire one 5742 laptop. I installed Linux Ubuntu 12.10 on it. I have one problem with it. no matter how I press the Fn+↑ or Fn+↓ keys I cannot adjust the Screen Brightness. It is at its maximum brightness and this drains the laptop battery. I did some googling and found out that you needed to change some settings in the grub file but I don't know exactly what to do. Can anyone help me?
closed as off-topic by To Do, Tim, Jorge Castro, Mikołaj Bartnicki, Eric Carvalho Aug 7 at 23:11
This question appears to be off-topic. The users who voted to close gave this specific reason:
Otherwise there are the commands below that can fix via the process you described. In the terminal type:
you will find a line like this:
change this line to (making sure to keep the quotation marks):
Save the file and then in the terminal type:
Then it should be fixed.
Hope this helps. :)
First let us check yiour VGA device code
The device code looks like
To set brightness
first know the output name
for example my output name is DVI-I-2
The brightness can be changed like this:
Well, I have a notebook Acer aspire 5742, and I had the same problem after installing Windows. The problem was with the drivers, specifically the VGA Intel video card driver was missing. I downloaded it from here! So may be the problem is not with the OS but the missing drivers!
I have a 4830t and the screen looked awful. I had to manual adjust the rgb gamma and the contrast. Now it looks a lot better.
I create a simple script to adjust it at boot:
You can adjust the color and contrast to fit your taste.
I hope this helps.
You can also adjust the brightness with