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4d1350f
(Get the code!)
Bugger, looks like we're completely dependent on NVIDIA releasing a binary driver. :-(
Ho hum. In the meantime there are a few useful scripts on the thread mentioned above that can be used to change the screen brightness (by exiting to a terminal, inserting values in proc and then returning to X). As a result I've got a couple in my home dir called (imaginatively) low.sh and high.sh. They contain something like the following:
#!/bin/bash
chvt 1
echo -n 10 > /proc/acpi/
chvt 7
Now to wait for NVIDIA to get a move on.