Switching off a T420s nVidia card from linux ? What ACPI call ?

Dear all,
I am the very happy owner of a T420s that I mostly use under Linux. Is there any simple way to switch off the nVidia card under Linux (i.e. without deactivating it in the BIOS) ?
The script proposed on https://launchpad.net/~hybrid-graphics-linux does terminate with "success", but does not switch the card off (it however deactivate the USB mouse ...)
As far as I understand, there is a magic string to write in /proc/acpi (when the module acpi_call is loaded) to do the trick, but so far I could not find it anywhere.
I suspect that Lenovo's engineers could tell what is the said string in 5min ...
Regards,
Francois

I finally found a script to do this. More details on my web page http://www.idiap.ch/~fleuret/glitches.html

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