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[Mihaly Toth <m_toth@xxxxxxxxxxx>]

I have the same problem if I install pommed. But I don't use it, because
if I install it, then screen backlight adjustment became very very slow
(another bug:) ) (Lucid, with Macbook 5.1)

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Keyboard backlight never remains off with nvidia-bl-dkms 0.15 series on MacBook 5.1
https://bugs.launchpad.net/bugs/519462
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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