The following in /etc/hal/fdi/preprobe seems to make the touchpad xinput
device disappear completely:

<?xml version="1.0" encoding="UTF-8"?>
<deviceinfo version="0.2">
    <device>
        <match key="info.product" string="AlpsPS/2 ALPS DualPoint TouchPad">
            <merge key="info.ignore" type="bool">true</merge>
        </match>
    </device>
</deviceinfo>

I can still make the pointer jump around by using two fingers on the
touchpad but accidental input activity does not seem very frequent.

-- 
ALPS DualPoint Touchpad flaky performance
https://bugs.launchpad.net/bugs/296610
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