If you use the KDE desktop, there is a checkbox for "Input devices" that disables the TrackPad. Gnome does not seem to have the same functionality out of the box.
See if the following is any help: http://www.thinkwiki.org/wiki/Synaptics ... iver_for_X
The problem isn't in disabling the touchpad manually, that's really easy to do, however it's hard to disable it automatically
when the trackpoint is in use (ie. the mouse cursor is being moved by it), which is probably why this topic was created in the first place.
Unfortunately, there's probably no easy way, you may take a look at "man 4 synaptics" to see all the options you can use to tune the touchpad, however it's still touchpad-only.
dmesg | grep input:
- that should give you some idea on how to do it. My lines are
input: SynPS/2 Synaptics TouchPad as /devices/platform/i8042/serio1/input/input5
input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/serio2/input/input15
so I list /sys/devices/platform/i8042/serio1/input/input5 to find a directory named "event5" and /sys/devices/platform/i8042/serio1/serio2/input/input15 to find another named "event15". Those names (5/5, 15/15) might differ if you ie. rmmod psmouse and modprobe it again, so don't extract those numbers from the dmesg output.
Now you can "cat /dev/input/event5" to get some output when the touchpad is active and "cat /dev/input/event15" when the trackpoint is active. So now it should be pretty easy to make a userspace daemon read(2) /dev/input/event15 and disable (with some delay) trackpoint if that input line is active (ie. using calls provided by the synaptics driver).