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?
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
xgamma -rgamma .8
You can adjust the color and contrast to fit your taste.
I hope this helps
you can also adjust the brightness with xcalib
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!
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: