I have the same problem with my macbook pro 7.1

I can't stop the back-light with F55 or the command line: 
echo 0 | sudo tee -a /sys/class/leds/smc\:\:kbd_backlight/brightness

but, after 60sec, if i didn't touch the keyboard, the back-light turn
off.

If i can help in any case...

-- 
Keyboard backlight never remains off with nvidia-bl-dkms 0.15 series on MacBook 
5.1
https://bugs.launchpad.net/bugs/519462
You received this bug notification because you are a member of Mactel
Support, which is the registrant for Mactel Support.

Status in Mactel Support: New

Bug description:
In Ubuntu  9.10 Karmic Koala, using nvidia-bl-dkms 0.15 series from the Mactel 
PPA, the keyboard backlight on my MacBook 5.1 will never remain completely off, 
by attempting to dim it all the way using the F5 keyboard dim key. It will 
decrease until the keyboard light turns off, and then it will turn back on 
within two seconds. It returns to brightness setting of 100, as confirmed by
cat /sys/class/leds/smc\:\:kbd_backlight/brightness

This bug is reproducible without using the backlight keys, with 
echo 0 | sudo tee -a /sys/class/leds/smc\:\:kbd_backlight/brightness



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