I had this same issue with my Dell Latitude D820 after upgrading from
gutsy to hardy. It did affect all my pointer devices (taping the touch
pad, mouse buttons next to the touch pad and USB mouse)
Andrew Oakley's xorg conf did fix the problem for me.
This xorg.conf section caused the problem:
Section "InputDevice"
Identifier "Generic Keyboard"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xfree86"
Option "XkbModel" "pc105"
Option "XkbLayout" "fi"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/psaux"
Option "Protocol" "PS/2"
Option "ZAxisMapping" "4 5"
EndSection
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[Hardy] External mouse on laptop will only double-click
https://bugs.launchpad.net/bugs/188351
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