[Bug 99103] Same output (DisplayPort) is used in multi-head configuration for different Devices/Displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99103

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
In short, this configuration (Zaphod style, with 4 screens per GPU) isn't
supported. The radeon driver only supports 2 screens per GPU in Zaphod mode.

Unless you really need multiple X11 protocol screens and/or static
configuration in xorg.conf, I'd suggest trying without xorg.conf and letting
the desktop environment manage the display configuration via RandR 1.4. Note
that in this case I highly recommend using at least the xf86-video-ati 7.8.0
release, possibly even current Git master, and ideally a newer version of Xorg
as well.

Alternatively, you could try combining two displays per Zaphod screen, but I'm
not sure that'll work out.

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