Can't adjust screen brightness on Macbook Pro 8.3, Oneiric

**kc600** · December 26th, 2011

It's like this guy says: http://askubuntu.com/questions/90640...acbook-pro-8-3

2011 8.3 MacBook Pro running 64bit 11.10.

The screen brightness keys seems to actually do things (i see the Ubuntu-style indicators in the top right part of the screen when a button is pressed), but nothing actually changes with regard to actual laptop screen brightness.

Is this a known issue? How can I adjust the screen brightness on my MacBook Pro?

I tried

Code:

sudo echo 4 > /sys/class/backlight/acpi_video0/brightness

but got

Code:

permission denied

. Doing

Code:

echo 10 | sudo tee /sys/class/backlight/acpi_video0/brightness

doesn't give the permission error, but has no effect that i noticed.

I installed pommed which also didn't change anything. (Or do i have to manually install key bindings after installing pommed?)

**DocteurX** · December 26th, 2011

This is not only a problem for the Macbook Pro 8.3, I'm running Ubuntu 11.10 64bit on Macbook Pro 8.2 and I have the same problem.

**DocteurX** · March 27th, 2012

Screen brightness now work on Macbook Pro 8.2.

Probably because of some recent update, yesterday I rebooted and sceen brightness adjestment now works perfeclty.

**DocteurX** · June 13th, 2012

Sorry about my previous message, brightness adjustment worked only for a day, it stopped working at the next reboot....

Nevertheless, here is a solution for Macbook Pro 8.2 :

( it's taken from https://help.ubuntu.com/community/MacBookPro8-2/Oneiric )

Code:

sudo add-apt-repository ppa:sforshee/apple-bl-gmux
sudo apt-get update
sudo apt-get install apple-gmux-dkms
sudo modprobe -r apple_gmux
sudo modprobe apple_gmux

Then in the file /etc/default/grub, add the following ligne

Code: