Scratch that idea, just checked a 12.04 system and it also reports 2.2 as its server side XI version.
chris@mythtv:~$ DISPLAY=:0 xinput --version xinput version 1.5.99.1 XI version on server: 2.2
Scratch that idea, just checked a 12.04 system and it also reports 2.2 as its server side XI version.
chris@mythtv:~$ DISPLAY=:0 xinput --version
xinput version 1.5.99.1
XI version on server: 2.2