Please could you verify whether executing the following commands restores 
tapping functionality for that X session:
$ synclient TapButton1=1
$ synclient TapButton2=2
$ synclient TapButton3=3
If so, then you are experiencing bug 378391 - though I can't imagine why
a custom kernel would avoid the problem.

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laptop touchpad does not register single/double/triple click
https://bugs.launchpad.net/bugs/380749
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