Public bug reported:

After a successful system update and reboot, touchpad was no longer working.
However, an external USB mouse worked just fine.

r...@sussch-laptop:/# cat /dev/psaux 
was silent during mouse movement.

r...@sussch-laptop:/# modprobe -l | grep psmouse
/lib/modules/2.6.24-24-generic/kernel/drivers/input/mouse/psmouse.ko

So, the module was loaded, but the touchpad still wasn't working.

r...@sussch-laptop:/# rmmod psmouse
r...@sussch-laptop:/# modprobe psmouse proto=imps

And the touchpad works again (without scrolling though) until a reboot /
shutdown is made.

r...@sussch-laptop:/# lsb_release -rd
Description:    Ubuntu 8.04.3 LTS
Release:        8.04

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: psaux touchpad update

-- 
touchpad no longer works after update
https://bugs.launchpad.net/bugs/419080
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