Ok well I have tried close to every single post about this problem that I could find and can not find a perm a fix for it.
The fn + brightness up/down buttons do not work at all they show it changing the brightness but it is still as max brightness and it starts to burn your eyes after a while.
What can I do to fix the problem?
I'm using the full desktop version of ubuntu.
In terminal:
sudo gedit /etc/default/grub
Look for the line that says this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Modify it as to say
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Save the file, shut down the window and insert the following in the terminal:
sudo update-grub
Reboot your laptop and (hopefully) it will work. I'm not guaranteeing anything, but this worked for my Acer and seems to work for a lot of models.
