[PATCH] psm.c: Better support for Synaptics guest device (pointing sticks on Thinkpads)

[Jan Kokemüller]

Hi,
I've written a patch for psm.c that makes the hw.psm.trackpoint sysctls 
work when using the TrackPoint as a Synaptics guest device. Not all 
Thinkpads support turning off the Touchpad in the BIOS, for example the 
SL510. The default settings of the TrackPoint are much too slow for me, 
so I needed this functionality badly.

There is also a new "touchpad_off" sysctl that disables the Touchpad but 
lets guest device inputs through.

Lastly I've adjusted the default TrackPoint sensitivity to match the 
official documentation, this was probably a typo.

Comments?
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