While attempting to use Xdmx to spread my display out between a x86 and a mips
(big endian SGI) box using xinerama, there are no visuals that match, and
therefore results in a failure.  See http://dev.gentoo.org/~geoman/dmxlog.txt
for the output log.  I believe the problem is due to the endian difference
between these two machines.  They appear to be using the same visual by default,
but they are reversed, eg:

(II) dmx[o0/hellfire:1]: 0x21 TrueColor   24b 8b/rgb 256 0xff0000 0xff00 0x00ff *
vs.
(II) dmx[o1/pimpdaddy:0]: 0x22 TrueColor   24b 8b/rgb 256 0x00ff 0xff00 0xff0000 *

I talked with ajax on irc, and he seems to think it shouldn't be too much of a
problem to add tracking of byteswapping on the fly per backend display.