It looks like this bug has changed over time; the touchpad does indeed
seem to be being misdetected by the kernel now - it wasn't in the
initial report, which was being correctly picked up by the synaptics X
input driver.

That means that this will actually be two separate bugs.  Let's first
deal with the kernel one, which will be masking what appears to be a
second one in the synaptics driver.

The device started to be identified as a Generic Wheel Mouse after an
update - could anyone identify which update it was?  That will make it
much easier to work out what's happened.  If you go to the Ubuntu
Software Centre you should be able to select “History” and get a list of
when all the upgrades were.

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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Alps touchpad detected as ImPS/2 Generic Wheel Mouse(in VAIO E series) after 
the kernel upgrade
https://bugs.launchpad.net/bugs/565543
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