Comment 2 for bug 312589

dpkg -s xserver-xorg
Package: xserver-xorg
Status: install ok installed
Priority: optional
Section: x11
Installed-Size: 648
Maintainer: Ubuntu Core Developers <email address hidden>
Architecture: i386
Source: xorg
Version: 1:7.4~5ubuntu3
Replaces: x11-common (<< 1:7.3+11), xserver-common (<< 7)
Depends: xserver-xorg-core (>= 2:1.5), xserver-xorg-video-all | xserver-xorg-video-4, xserver-xorg-input-all | xserver-xorg-input-2.1, xserver-xorg-input-evdev, libc6 (>= 2.3.4), debconf (>= 0.5) | debconf-2.0, xkb-data | xkb-data-legacy, x11-xkb-utils, mdetect
Recommends: libgl1-mesa-dri, udev
Conflicts: x11-common (<< 1:7.3+11), xserver-common (<< 7), xserver-xfree86 (<< 6.8.2.dfsg.1-1)
Description: the X.Org X server
 This package depends on the full suite of the server and drivers for the
 X.Org X server, as well as providing a configuration infrastructure to manage
 xorg.conf. It does not provide the actual server itself, but removing it
 is strongly discouraged.
Original-Maintainer: Debian X Strike Force <email address hidden>

dpkg -s xserver-xorg-video-ati
Package: xserver-xorg-video-ati
Status: purge ok not-installed
Priority: optional
Section: x11