Ubuntu – Macbook Pro boots with full screen brightness and keyboard backlight

12.04backlightbrightnessmacbook

I have dual-booted my Macbook Pro with Ubuntu 12.04 . Whenever i log-in to Ubuntu, it does so with full screen brightness and keyboard backlight at full . How do i get rid of this? How can i tweak the start-up setting for screen brightness and disable keyboard backlight at start-up?

Best Answer

To fix the screen brightness on my Macbook I stopped the apple_bl kernel module from being loaded. This seem to fix this for me.

Create a file called: /etc/modprobe.d/blacklist-applebl.conf
In the above file add the line:
```
 blacklist apple_bl
```
Reboot.

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Adjust Screen Brightness on New MacBook Pro 8,3

Are you using ubuntu on mac? If yes then you can change your screen brightness using the following command:

echo 4 | sudo tee /sys/class/backlight/acpi_video0/brightness

Value range: 1 to 10 [1 lowest, 10 highest]

Also you can set the brightness at start-up. Append the line in /etc/rc.local before exit 0

Keyboard – How to Disable Macbook Keyboard Backlight

Make the keyboard backlight device writable by everyone:

sudo chmod 777 /sys/class/leds/smc::kbd_backlight/brightness

Then, in your ~/.bash_aliases, add:

echo 0 | tee -a /sys/class/leds/smc::kbd_backlight/brightness

Alternatively, if you want the backlight to be disabled for all users, then add that line instead to /etc/profile.d/custom.sh.

The only caveat I've noticed is that unlocking your screen occassionally appears to reset the backlight to full brightness. Unfortunately, I don't know what's causing this.

Best Answer

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Adjust Screen Brightness on New MacBook Pro 8,3

Keyboard – How to Disable Macbook Keyboard Backlight

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