Workarounds seems to be:

1)
CTRL+ALT+F2 and then CTRL+ALT+F7

This sould make it work until next reboot

http://ubuntuforums.org/showthread.php?t=1470117

2)
Add acpi=off to the boot line in grub

http://ubuntuforums.org/showthread.php?p=9248244#post9248244

Also, as far as I know, the problem only happens on HP DVx machines
running 64 bit.

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touchpad enable/disable button locks whole keyboard
https://bugs.launchpad.net/bugs/585008
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