I suggest finding a temporary setup where the backlight control works,
in which the nvidia driver is not installed, and then looking at "lsmod
| grep _bl" or the contents of /sys/class/backlight/ which should hint
at the module name that controls it. We can't blame the nvidia driver if
the backlight has never worked under any Linux on the machine (though
that appears to be the problem on my MBA 3,1).
Also, you need to exclude the possibility that maybe your Macbook Pro hardware
is still too new to be fully recognized by the 2.6.38 kernel in natty. So if
you can't find a test setup above in which the backlight control ever works,
please try temporarily installing the latest mainline kernel:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.39-rc4-natty/
(linux-image-*.deb)
I notice there have been a couple of commits to the apple_bl (formerly
mbp_nvidia_bl) module in those recent kernels.
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https://bugs.launchpad.net/bugs/743352
Title:
LCD backlight doesn't respond to brightness control keys
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