root@displays:~/debug# X :0 -isolateDevice 'PCI:1:0:0' -config /root/debug/xorg.2.conf 

X.Org X Server 1.7.7
Release Date: 2010-05-04
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.37-trunk-amd64 x86_64 Debian
Current Operating System: Linux displays 2.6.39-bpo.2-amd64 #1 SMP Tue Jul 26 10:35:23 UTC 2011 x86_64
Kernel command line: BOOT_IMAGE=/vmlinuz-2.6.39-bpo.2-amd64 root=/dev/mapper/displays-root ro quiet
Build Date: 18 February 2011  08:27:24PM
xorg-server 2:1.7.7-13 (Cyril Brulebois <kibi@debian.org>) 
Current version of pixman: 0.16.4
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Thu Sep 15 17:43:20 2011
(++) Using config file: "/root/debug/xorg.2.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(II) [KMS] Kernel modesetting enabled.
SELinux: Disabled on system, not enabling in X server