ACPI external monitor switch does not work anymore

[Alexandre Otto Strube]

The "fn-f7" key combination worked until friday, aug 3 2012. After an upgrade that somehow erased xorg, the functionality is gone. The package acpi-support is still installed though.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: acpi-support 0.140
ProcVersionSignature: Ubuntu 3.5.0-8.8-generic 3.5.0
Uname: Linux 3.5.0-8-generic x86_64
ApportVersion: 2.4-0ubuntu6
Architecture: amd64
Date: Mon Aug 6 13:38:06 2012
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: acpi-support
UpgradeStatus: Upgraded to quantal on 2012-07-24 (12 days ago)