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.
sudo nano /etc/default/grub
change GRUB_CMDLINE_LINUX_DEFAULT to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
Controls are working.
1Works on #! Crunchbang Waldorf too on a native install to Aspire S5– MeredithSep 29, 2013 at 12:40
YEEES! thank you! so many brightness ubuntu issues, so many posts... finally I found the one for me! after monnnths! May 6, 2014 at 1:28
Didn't work for me sadly on Linux Mint 19.1 with an Acer Aspire 5810TG. Dec 28, 2018 at 19:29
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 !!!
But this is for manual bright up with console? My answer is to enable the buttons of the keyboard– JorgeeFGMay 4, 2013 at 22:36