Bug#500800: xorg: -isolatedevice fails: multiseat impossible

Package: xorg
Version: 1:7.3+10
Severity: important

the -isolatedevice option now always fails with:

Fatal server error:
Bus types other than PCI not yet isolable

No matter what BusID you specify. This means that multiseat (>1 screen/mouse/keybrd/videocard/xserver) now is impossible.

This happened a while back for the first time. In February 2008 my 2nd PCI videocard failed so that was the end of my 2-seater.
I got the error message for the first time after a Sid dist-upgrade with just the APG card on August 4th 2008. But at that time it did not matter.
Just now, however, I finally got additionally a GeForce 6200 PCI card and it turns out -isolatedevice *always* gives an error.

It does not fail with xorg 1:7.2-5 with which I am running now. But that means that only Etch still gives a functional multiseat.

The hardware looks like this:
00:08.0 VGA compatible controller: nVidia Corporation NV44A [GeForce 6200] (rev a1)
01:00.0 VGA compatible controller: nVidia Corporation NV18 [GeForce4 MX 4000 AGP 8x] (rev c1)

and the pieces in xorg.conf:

        Identifier "nvidia0"
        BusID       "PCI:1:0:0"
...
        Identifier "nvidia1"
        BusID       "PCI:0:8:0"

and the pieces in /etc/gdm/gdm.conf:

[server-Standard]
name=Standard server
command=/usr/bin/X1 :0 -layout X1 -dpi 110 -deferglyphs 16 -isolateDevice \"PCI:1:0:0\" vt7
...
[server-2nd]
name=2nd server
command=/usr/bin/X0 :1 -layout X0 -dpi 110 -deferglyphs 16 -isolateDevice \"PCI:0:8:0\" -sharevts

The latter 2 commands cause the error.

Thanks
Hugo Vanwooerkom

-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 2.6.26-1-686 (SMP w/1 CPU core)
Locale: LANG=en_US.ISO-8859-15, LC_CTYPE=en_US.ISO-8859-15 (charmap=ISO-8859-15)
Shell: /bin/sh linked to /bin/bash

Versions of packages xorg depends on:
ii konsole [x-terminal 4:3.5.9.dfsg.1-2+b1 X terminal emulator for KDE
ii libgl1-mesa-glx [li 7.0.3-1              A free implementation of the OpenG
ii libglu1-mesa        7.0.3-5              The OpenGL utility library (GLU)
ii x11-apps            7.3+1                X applications
ii x11-session-utils   7.3+1                X session utilities
ii x11-utils           7.3+1                X11 utilities
ii x11-xfs-utils       7.3+1                X font server utilities
ii x11-xkb-utils       7.4+1                X11 XKB utilities
ii x11-xserver-utils   7.3+2                X server utilities
ii xauth               1:1.0.3-1            X authentication utility
ii xfonts-100dpi       1:1.0.0-4            100 dpi fonts for X
ii xfonts-75dpi        1:1.0.0-4            75 dpi fonts for X
ii xfonts-base         1:1.0.0-5            standard fonts for X
ii xfonts-scalable     1:1.0.0-6            scalable fonts for X
ii xfonts-utils        1:7.4+1              X Window System font utility progr
ii xinit               1.0.8-1              X server initialisation tool
ii xkb-data            1.2~cvs.20080501.1-1 X Keyboard Extension (XKB) configu
ii xserver-xorg        1:7.3+10             the X.Org X server
ii xterm [x-terminal-e 235-1                X terminal emulator

Versions of packages xorg recommends:
ii xorg-docs                     1:1.4-2    Miscellaneous documentation for th

xorg suggests no packages.

-- no debconf information