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+ up or Fn + down 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?
Otherwise there are the commands below that can fix via the process you described. In the terminal type:
sudo gedit /etc/default/grub
you will find a line like this:
change this line to (making sure to keep the quotation marks):
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Save the file and then in the terminal type:
Then it should be fixed.
Hope this helps.
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
xgamma -bgamma .6
xgamma -ggamma .7
xcalib -contrast .88
You can adjust the color and contrast to fit your taste.
I hope this helps
you can also adjust the brightness with xcalib