Brightness in Trisquel-mini (lxde) for Samsung users

If the brightness keys (Fn+F2 and Fn+F3) don't work, follow this tutorial.

Open up the terminal (Trisquel Menu -> Accessories -> Terminal) and install the xfce4-power-manager package:

 sudo apt-get install xfce4-power-manager xfce4-power-manager-data

After this, edit the file "autostart" by entering this command.

 sudo nano /etc/xdg/lxsession/Trisquel-mini/autostart

Replace the line "@gnome-power-manager" with "@xfce4-power-manager" (without the quotes). Type Control-X to exit, press the Y key and then press enter to save the file.

Edit the grub bootloader configuration file:

 sudo nano /etc/default/grub

change the line:

 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to:

 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Again, type Control-X to exit, press the Y key and then press enter to save the file.

Update the grub bootloader configuration:

 sudo update-grub
 sudo reboot

Now the brightness keys should work.

• This issue has been resolved in kernel version 3.13