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My Ubuntu 12.04 can't change brightness

Asked by Arie Setiawan

I have just installed ubuntu on my laptop 12.04, but
the brightness can not be changed. I have been
pressing the FN + Up. But it does not work.

This specification of my laptop :
- Brand/Type : Acer 4750
- Proccessor : core i3-2310
- VGA : intel HD Graphics 3000

I'm so happy if you want to help me :)

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Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#1

Try:

gksudo gedit /etc/default/grub

Find this line:
GRUB_CMDLINE_LINUX="quiet splash"

Change it to:
GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux acpi_backlight=vendor"

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

Reboot to test. Source:
http://askubuntu.com/questions/75219/screen-brightness-not-adjustable-for-acer-aspire-s3

Revision history for this message
Arie Setiawan (ariesetiawan325) said : 		#2

I have tried the above. But it did not work.

Can you help with this problem?

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