[Bug 56435] New: [Evergreen+R600 multiseat] KMS only works on one card at a time---two X servers for multiseat and only one works.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56435

          Priority: medium
            Bug ID: 56435
          Assignee: xorg-driver-ati at lists.x.org
           Summary: [Evergreen+R600 multiseat] KMS only works on one card
                    at a time---two X servers for multiseat and only one
                    works.
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: skomorokh at harmless.ca
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/Radeon
           Product: xorg

Created attachment 69121
  --> https://bugs.freedesktop.org/attachment.cgi?id=69121&action=edit
xorg.seat1.conf

Trying to port a long functioning fglrx multiseat setup to use the radeon
driver as the X.org 1.13.0 in Ubuntu 12.10 is incompatible with the old fglrx
and the new fglrx is incompatible with my R600 (4350). 

What happens is both cards/screens successfully change modes for the graphical
console. However, when KDM comes up, only seat2 (4350) enters X. seat1 (5770)
fails with a KMS error.  

[    60.389] (EE) RADEON(0): [drm] failed to set drm interface version.
[    60.389] (EE) RADEON(0): Kernel modesetting setup failed

If I exit X and restart (sans xorg conf), the 5770 works fine (of course the
second server is not started).

I am launching the two X servers via KDM thusly (note shared vts):

ServerArgsLocal=-config xorg.seat1.conf -nolisten tcp -isolateDevice PCI:2:0:0
ServerArgsLocal=-config xorg.seat2.conf -nolisten tcp -isolateDevice PCI:1:0:0
-sharevts -novtswitch


I have udev rules tagging the input devices and those xorg.seat*.conf files
(attached) use MatchTag to work with that. Their Device sections look like: 

Section "Device"
        Identifier  "Seat1"
        Driver      "radeon"
        BusID       "PCI:2:0:0"
        Option      "Int10" "off"
EndSection

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