[Edgy]dpkg-reconfigure xserver-xorg fail to detect hardware

see https://launchpad.net/distros/ubuntu/+source/xorg/+bug/68390 :
Binary package hint: xserver-xorg

when execute dpkg-reconfigure xserver-xorg, (debconf?) detect a vesa card and generic monitor, when always detect the card and the monitor, at the instalation no were problems.

Information :
card -> ATI Technologies, Inc. RV350 AR [Radeon 9600 XT]
monitor -> PHILIPS 107T

package:

Paquete: xserver-xorg
Estado: instalado
Instalado automáticamente: no
Versión: 1:7.1.1ubuntu6
Prioridad: opcional
Sección: x11
Desarrollador: Ubuntu Core Developers <email address hidden>
Tamaño sin comprimir: 598k
Depende de: xserver-xorg-core, xserver-xorg-video-all | xserver-xorg-video,
            xserver-xorg-input-all | xserver-xorg-input, debconf, xkb-data |
            xkb-data-legacy, xbase-clients
Predepende de: x11-common (>= 7.0.0-0ubuntu3)
Recomienda: laptop-detect, xresprobe, mdetect, discover1 | discover
Tiene conflictos con: xserver-xfree86 (< 6.8.2.dfsg.1-1), xserver-common
Remplaza: xserver-common
Descripción: 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.

the hardware info was getted from original xorg.conf

Edit:

I've tested too in my laptop, and there was the same problem, is a serious bug, a very serious bug because the user can make not working his X session.

Laptop is amilo with ATI 9700 mobile