Migration from oneiric to precise beta1removes touchpad support on MacBookPro

When upgrading from oneiric to precise beta1 the support of touchpad vanished.

I had to reinstall xserver-xorg-input-synaptics to get it back working (do-release-upgrade removes it).

The text in https://wiki.ubuntu.com/PrecisePangolin/TechnicalOverview/Beta1 states that ClickPads are recognized out of the box (at least on MacBook ones) which is not the case since I had to reinstall this package.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager-core 1:0.156.6
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
NonfreeKernelModules: wl nvidia
ApportVersion: 1.94-0ubuntu1
Architecture: amd64
Date: Mon Mar 5 10:18:46 2012
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1330860619
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 966
 com.ubuntu.update-manager window-width 1678
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64+mac (20110427.1)
ProcEnviron:
 TERM=screen-bce
 LC_COLLATE=C
 PATH=(custom, user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2012-03-02 (2 days ago)