Eric: You say "no longer works." When did it work? With a previous
release? When booted in BIOS-compatibility mode? You're sure it was
using apple_bl when it did work?

Does nouveau work with EFI boot? If so, it's backlight control may work.
If not, the mactel support PPA has a mbp-nvidia-bl-dkms package which
essentially implements the backlight support from nouveau, which may be
worth trying. I know that on some models backlight adjustment is
available through the graphics card, but the binary-only nvidia driver
does not implement backlight control afaik.

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https://bugs.launchpad.net/bugs/952698

Title:
  Backlight no longer works on Macbook Pro5,5 with EFI boot

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