Have you guys tried specifying BusID in your xorg.conf?
BusID "bus-id"
This specifies the bus location of the graphics card. For
PCI/AGP cards, the bus-id
string has the form PCI:bus:device:function (e.g., "PCI:1:0:0"
might be appropriate
for an AGP card). This field is usually optional in single-head
configurations when
using the primary graphics card. In multi-head configurations,
or when using a sec-
ondary graphics card in a single-head configuration, this
entry is mandatory. Its
main purpose is to make an unambiguous connection between the
device section and the
hardware it is representing. This information can usually be
found by running the
pciaccess tool scanpci.
--
support graphics card hot switch
https://bugs.launchpad.net/bugs/312756
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