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Date: Mon, 22 Apr 2013 15:34:15 -0400
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-user] Questions before I start building a new home for
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> Is your comment about the card only, or will this "APU" cause trouble?

Not sure but I would think so.  Each different GPU chip is a different
X driver, and if you have more than one X driver you need to use
Xinerama - unless ATI did something sneaky in their X drivers.

The problems I had were with two identical nVidia cards.  One driver
binary loaded, but it showed X two driver instances.

Before the HD, most four-monitor cards were just two separate cards on
one PCB, so no different than having two cards.  The HD (and the
matrox cards) have *one* GPU and thus show one driver instance to X.