Ubuntu
acpi package

cant adjust the brightness on ubuntu 12.04

Asked by phil

I have just installed 12.04 Linux on my Packard bell easynote tx86. However, I can't change the brightness of the screen with my F11 or F12 keys (an icon comes up on the screen showing the screen is being reduced, but it doesnt actually change the brightness). If i go into setting and to brightness I can adjust the bar for brightness in there as well but it doesnt change the brightness either.plz help...

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Ubuntu acpi Edit question
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actionparsnip (andrew-woodhead666) said : 		#1

Try:

gksudo gedit /etc/default/grub

Change the line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to:
GRUB_CMDLINE_LINUX="GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"

Save the new file, close gedit and run:
sudo update-grub

Reboot to test

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#2

Or try:

GRUB_CMDLINE_LINUX="GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Remember to run:
sudo update-grub

after each change to apply it and reboot to test

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phil (philipini17) said : 		#3

well thanks for the help but im really new to ubuntu and im kinda stupid :P so where should i change those lines?

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actionparsnip (andrew-woodhead666) said : 		#4

Run the gksudo command in terminal, the rest is a text file edit, which I am sure you can do

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