I'm the OP and Ubuntu 11.04 continues to work for me with:
aptitude show nvidia-current
Package: nvidia-current
State: installed
Automatically installed: no
Version: 270.41.06-0ubuntu1
cat /var/log/Xorg.0.log
(...)
[ 17.876] (II) NVIDIA(0): NVIDIA GPU GeForce 9400M (C79) at PCI:3:0:0 (GPU-0)
[ 17.876] (--) NVIDIA(0): Memory: 524288 kBytes
[ 17.876] (--) NVIDIA(0): VideoBIOS: 62.79.3e.00.0e
(...)
cat /etc/X11/xorg.conf
Section "Device"
Identifier "Default Device"
Option "NoLogo" "True"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
However, prompted by Dimitry's comment I had checked the drivers and had
found that in this fresh Ubuntu 11.04 installation, Jockey had
installed the nvidia-173 drivers by default. They worked fine, but I
decided to try the nvidia-current (which I had used before with the
previous install) and used Jockey to switch. This made Jockey install a
new xorg.conf without the EnableBrightnessControl option. On reboot the
keyboard brightness keys did therefore not work, I had to add the option
to xorg.conf again and restart X.
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https://bugs.launchpad.net/bugs/726692
Title:
Screen backlight adjustment stopped working on MacBook Pro 5,4 and
other hardware
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