>From the manpage for the mga driver:
Support for the second head on G400
cards requires a binary-only "mga_hal" module that is available from
Matrox <http://www.matrox.com>, and may be on the CD supplied with the
card. That module also provides various other enhancements, and may be
necessary to use the DVI (digital) output on the G550 (and other
cards).
--
G550 (dual) DVI does not work
https://bugs.launchpad.net/bugs/154231
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