I installed Ubuntu 14.04.02 as dual boot in a macbook pro 2012 13 I noticed that all function buttons works but except those that regulate the brightness of the screen.How do I fix this problem?

  • My macbook has not nvidia graphic card, so probably nvidia drivers doesn't fix the problem in this case
    – Riccardo
    Feb 24, 2015 at 14:10
  • BTW, can you change the brightness using the command line? Feb 24, 2015 at 14:24
  • I was reading this post [link]askubuntu.com/questions/57236/…. When I run ls /sys/class/backlight/*/brightness, my output is /sys/class/backlight/apple_backlight/brightness. /sys/class/backlight/intel_backlight/brightness. Which one do I use? apple_backlight or intel_backlight?
    – Riccardo
    Feb 24, 2015 at 14:35
  • Ok, I can change the brightness using command line but is there another method?
    – Riccardo
    Feb 24, 2015 at 14:47

1 Answer 1


I found an answer to this. However I have an iMac 2011, so it could solve your problem.

You need to edit the grub file /etc/default/grub change the line



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

Then run:

sudo update-grub

Rebooot your computer and voilà.

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