The issue, that is still outstanding in the NVIDIA linux kernel module affects laptops with NVIDIA graphics chipsets and prevents the laptop backlight brightness from being changed.
Not sure if this works for all distros but under Ubuntu, login as normal and switch to VT1, (Ctrl - Alt - F1).
Log in as root, then:
echo 100 > /proc/acpi/video/NVID0/LCD/brightness
(The path will always be /proc/acpi/video/ but the last part may vary depending on the model)
This will set the laptop backlight to full brightness, you could of course enter any other number for a reduced brightness.
To return to your desktop switch back to VT7 (Ctrl - Alt - F7)
It would seem that VT1 uses the nv kernel module allowing the brightness to be set and VT7 (The X graphical environment) uses the nvidia kernel module.
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