Thanks for this very useful posting on disabling NVIDIA. It works pretty well, also in Debian squeeze. The only issue was that checking discharge rate from the command line did not work:
bertos@debian:~/acpi_call$ grep rate /proc/acpi/battery/BAT0/state
grep: /proc/acpi/battery/BAT0/state: No such file or directory
From the Power Statistics application under the battery icon in gnome it was clear that the discharge rate dropped from around 17 W to 11 W at light use.
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