Acer Aspire 5755 Brightness Control Not Working!

Asked by Sidhant Verma

Freshly Installed Ubuntu 12.04 LTS. All goes fine except my brightness control of screen is not working with key combination(fn+ left/right) as well as from display settings!

What can I do ? Even little help is appreciated!

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Ubuntu xserver-xorg-video-intel Edit question
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actionparsnip (andrew-woodhead666) said :

Have you tried the bootoptions:

acpi_osi=Linux acpi_backlight=vendor


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Sidhant Verma (sidhantverma-deactivatedaccount) said :

Sir, Can you elaborate how to do this?

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actionparsnip (andrew-woodhead666) said :


gksudo gedit /etc/default/grub

find this line:

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

Save the new file. close gedit then run:
sudo update-grub

Reboot to test. I assume you at least TRIED to find guides on how to add boot options and didn't simply ask for clarification.....

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Cole (coleibe3) said :

Thank you Andrew. This procedure seems to have fixed a simular problem I was having with a new install of 12.10 on a Samsung laptop.

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