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4

This question already has an answer here:

I've installed Ubuntu 12.04 in an Acer Timeline X 5830TG and brightness controls were not working (Fn + Key), even the Ubuntu's one.

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marked as duplicate by Luis Alvarado♦ May 4 '13 at 12:19

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up vote 12 down vote accepted

Solution:

Edit GRUB:

sudo nano /etc/default/grub

change GRUB_CMDLINE_LINUX_DEFAULT to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

then:

sudo update-grub

Reboot.

Controls are working.

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1  
Works on #! Crunchbang Waldorf too on a native install to Aspire S5 – Meredith Sep 29 '13 at 12:40
    
YEEES! thank you! so many brightness ubuntu issues, so many posts... finally I found the one for me! after monnnths! – Alexandre Holden Daly May 6 '14 at 1:28
up vote 0 down vote

Most simple and fast way to do this.... Use this command

xrandr --output LVDS1 --brightness 0.5

Set the value in between 0 to 1 like in this case it is 0.5 This works for me Try this !!!

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But this is for manual bright up with console? My answer is to enable the buttons of the keyboard – JorgeeFG May 4 '13 at 22:36

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