2x DVI with "intel" driver?

Keith Packard keithp at keithp.com
Fri Mar 23 08:58:00 PDT 2007

On Fri, 2007-03-23 at 12:38 +0100, Stefan Dirsch wrote:
> Hi
> I wonder if it is possible to use a 2x DVI setup with the "intel"
> driver.

Yes, you can even buy 2x DVI ADD2 cards that work quite nicely.

> I am using a 965G board (BTX format) with VGA+DVI output. I can use
> both outputs of the mainboard for a dualhead configuration. But after
> plugging in an additional ADD2 card (PCIe with 1xDVI) the DVI output
> of the mainboard is disabled. 

Each SDVO link uses four lanes on the PCI-E bus; I'm reasonably sure
that problem here is that the expansion card and the built-in SDVO link
are wired to the same set of lanes. I'm impressed that it works at all;
my experience with SDVO cards is that when something isn't right, the
machine won't even POST.

I suspect that if you want two DVI outputs, you'll need to use a dual
DVI card and ignore the DVI on the motherboard; I haven't seen an ADD2
card that is designed expressly for this purpose.

keith.packard at intel.com
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