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Date: Wed, 24 Apr 2013 20:53:46 -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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> I understood your reply "ATI Radeon HD 6870" as an indication that you
> found this card to work with multiple heads (monitors).

Yes.

> I also interpreted your response as an indication that your 4
> monitors are driven by 2 cards plugged into the motherboard.

No.  The one Radeon HD I have can drive up to four monitors all by
itself, with just one GPU chip.

> > The problems I had were with two identical nVidia cards.  One driver
> > binary loaded, but it showed X two driver instances.
> I'm reading this as you expected the driver to load once and be "shared"
> by all of the monitors/graphics card instances.  That seems like a
> reasonable assumption but I'm not understanding how that caused the X issue.

One driver but two device instances registered with X, one for each card.