BTW, If I use a DVI-to-VGA adapter, and run a vga cable to the monitor,
then one output port shows fine pink& black vertical bars; the other
port shows all black (and the monitor thinks the all-black screen does
have valid video out, at 1600x1200) (the pink-bars vga out is also
1600x1200).   By contrast, running a DVI cable simply results in the
monitor complaining: "no signal".   Yes, I have tried restarting Xserver
before & after the cable switches.

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https://bugs.launchpad.net/bugs/900111

Title:
  X server on Matrox g550 is all black (no output)

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