I'm trying to fix the backlight issue on my Macbook Pro Retina after installing Ubuntu 16.04.
The problem is the backlight dimmer buttons F1 F2 or Fn+F1 and Fn+F2 are not working at all after installing Ubuntu 16.04.
I have run in some answers that recommends to set the
acpi_backlight=vendor on the
GRUB_CMDLINE_LINUX_DEFAULT parameter and rebooting it and still not working.
Also I've tried this other workaround https://itsfoss.com/fix-brightness-ubuntu-1310/ but the
ls /sys/class/backlight/ directory returns different files, I've also tried to set some configuration similar to the one proposed on the link but then I got an error at booting Ubuntu on the graphics card.
Have anybody figured this out?