Brightness not working Ubuntu 15.04 on acer aspire 7715z

Question

If anyone has any suggestions or links, I'd be truly grateful. The brightness is not working, the screen stays at maximum brightness.

Thank you for your help. I followed the instructions from the link below and now the brightness adjustment works.

Answer 1

See https://askubuntu.com/a/604913/50254

Basically, do following:

 sudo nano /usr/share/X11/xorg.conf.d/20-intel.conf

Add following lines

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

Save (CTRL+X) and reboot the system. Function keys plus arrows should now correctly adjust the backlight and you have 20 possible levels instead of only 4 levels supported by BIOS.