[Bug 40915] New: Unable to use 2 x dual head radeon cards in the same PC

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Sep 15 09:43:02 PDT 2011


           Summary: Unable to use 2 x dual head radeon cards in the same
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: mark.cave-ayland at siriusit.co.uk
         QAContact: xorg-team at lists.x.org

Hi all,

We are currently trying to use a PC with 2 x Radeon cards on Debian Squeeze
using a backports 2.6.39 kernel to drive 3 large display monitors in our
support centre. Unfortunately we are currently unable to drive both cards at
the same time using two different X server processes. As discussed previously
on the xorg mailing list (see
http://lists.freedesktop.org/archives/xorg/2011-August/053467.html), this
appears to be a radeon driver-specific issue since if we switch one of the
monitors over to the internal Intel graphics card then all is well.

Attached to this bug report are the outputs from launching both X servers and
other information I hope will be useful in order to help someone find the

Currently the two X sessions are launched in separate terminals like this:

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

When both are launched together, only the 'PCI:1:0:0' display appears to be
enabled - the second 'PCI:2:0:0' currently remains off in power-save mode.

Many thanks,


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