[Intel-gfx] Question about driver capatibilities - triple monitor?

[Daniel Vetter]

On Tue, Jan 22, 2013 at 7:36 AM, Ian Pilcher <arequipeno at gmail.com> wrote:
> On 01/21/2013 06:05 PM, Csillag wrote:
>> But now, thanks to GIGABYTE's PR about Thunderbolt and 4K (
>> http://www.gigabyte.com/MicroSite/323/4k.html ), I realized that it
>> might be possible to use a "DisplayPort to Dual-DisplayPort Adapter" to
>> split a DisplayPort 1.1 output into two channels, and drive two monitors
>> from there. (Of course the resolution is limited, but 1920 x 1200 is
>> just what I need.)
>
> Be careful.  When I looked into those "splitters", I found out that
> they are closer to "federators".  In other words, they take 2 displays
> and make them looks like 1 giant display to the operating system.
>
> So 2 1920x1200 displays would appear to be a single 3840x1200 display.
>
> This will give you the number of pixels that you expect, but your
> desktop environment is unlikely to play all that well with such a
> configuration.
>
> (If anyone knows of a device that doesn't operate this way, please let
> me know.  I'll almost certainly buy a couple.)

Multistream display port should make this possible, though currently
no Intel hw supports it (nor any other open-source driver fwiws) :(

For your 3 monitor required a decen ivb based board should be good
enough, as long as you keep the restriction in mind that 2 of them
need to have the same dotclock (which in practice boils down to either
2x DP monitors or 2x identical monitors with the same type of
connector).
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch