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-   -   4K in Linux? (http://www.nvnews.net/vbulletin/showthread.php?t=143123)

jesmith 12-29-09 11:11 AM

4K in Linux?
 
A client has asked whether we can build a set up to drive a Sony SRXT105 at 4096x2160 resolution. Looking at the specs, it appears that this projector takes 4 DVI Dual-Link inputs to drive 4 quadrants at 2048x1080 each.

I'm thinking that the computer would have 2 PCIE x16 slots, and I'd stuff a Quadro FX 5800 in each. I'd run two DVI cables from each of those into the Sony.

Then I'd set up my Xorg.conf to build a virtual desktop spanning these 4 display areas, and spread our rendering over the whole thing.

Does anyone here see any show-stopper problems with this approach?

Anyone here done anything like this before?

JaXXoN 12-29-09 02:13 PM

Re: 4K in Linux?
 
Hi!

Out of curiosity, I briefly checked all material to be found at
http://pro.sony.com/bbsc/ssr/cat-pro...oduct-SRXT105/

Seems like you are right that the beamer takes four 2048x1080 DVI signals
and combines it to a 4096x2160 picture. I feared that it might be necessary
that the input signals need to synchronized which might be tricky to archive
amongst two separate cards, but it seems there are no such restrictions.

So my understanding is that you effectively just need to create an xorg.conf
for a dual GPU, four LCD setup with xinerama. However, I couldn't easily find
any information if those LKRI 005 input cards supply a proper EDID via I2C
(in order for the X-Server to autodetect the resolution and calculate the
proper display timing), so it might be necessary to manually add a
modeline or fake an EDID.

However, please note that a dual GPU xinerama solution has a number of
restrictions and known bugs. But since you have those fairly expensive
FX5800 cards, you might ask nvidia if there is a remote chance to get
SLI Mosaic support for them: this technique works similar to Xinerama,
but splits the display on driver level rather than X-Server level.
SLI Mosaic is actually only available for QuadroPlex systems, but those
devices actually just consist of a bunch of Quadro cards plugged into
a PCIe backplane, connected to the PC through a PCIe bridge card.
So technically, I don't see why SLI Mosaic shouldn't work for Quadro
cards directly plugged into a PC (I guess it's just an marketing issue).

regards

Bernhard

jesmith 12-29-09 02:33 PM

Re: 4K in Linux?
 
Since the client is considering buying a $70K+ projector, I don't know if the added $4K for the Quadro Plex 2200 D2 would be a problem for them. Looking at the blurb on SLI Mosaic Mode, it does sound like exactly what I want. It says it works with Linux, so perhaps that is a simpler solution?

JaXXoN 12-29-09 02:54 PM

Re: 4K in Linux?
 
Quote:

Originally Posted by jesmith (Post 2153311)
It says it works with Linux, so perhaps that is a simpler solution?

Per data sheet, QPlex seems to be the ideal solution in this case - however,
you may like to ask an nvidia sales rep to be 100% sure - at the premium
price tag of those device, I'd expect premium support :-)

regards

Bernhard

zander 12-29-09 03:56 PM

Re: 4K in Linux?
 
We do recommend SLI Mosaic mode to drive power wall configurations and projects such as the one being considered in this case. SLI Mosaic is fully supported on Linux.

bwheaton 12-29-09 11:22 PM

Re: 4K in Linux?
 
The SLI option would probably cover this, but your show stopper without it would be that the four outputs wouldn't be in sync.

Consider two outputs and two Matrox Dual-Head to go cards. That would make one output top left and right, and the other bottom left and right.

Regards,

Bruce Wheaton

JaXXoN 12-30-09 09:01 AM

Re: 4K in Linux?
 
Quote:

Originally Posted by bwheaton (Post 2153712)
The SLI option would probably cover this, but your show stopper without it would be that the four outputs wouldn't be in sync.

I didn't checked in full detail, but the available documentation of the
beamer didn't state that it is required to have the signals in sync.

Quote:

Originally Posted by bwheaton (Post 2153712)
Consider two outputs and two Matrox Dual-Head to go cards. That would make one output top left and right, and the other bottom left and right.

Unfortunately, the DH2G/TH2G don't support 2048x1080:
http://www.matrox.com/graphics/en/pr...solutions.html
http://www.matrox.com/graphics/en/pr...solutions.html
Maximum is 1920x1080 (so you would get 16:9 at 3840x2160 instead of
4k at 4096x2160 - this might be good enough, but that depends on the
application, me thinks).

The DH2G would certainly be the cheaper alternative to QPlex, i.e. I'm running
six 1680x1050 displays with two TH2Gs on a single 260GTX (5040x2100):
http://www.nvnews.net/vbulletin/showthread.php?t=126134 (post #26)

I guess the DH2G/TH2G hardware would be capable of splitting a 4096x1080
signal into 2x 2048x1080, but Matrox would need to update it's firmware
accordingly. So it seems that the only OOTB and fully supported solution is
the QPlex.

regards

Bernhard

JaXXoN 12-30-09 09:18 AM

Re: 4K in Linux?
 
Quote:

Originally Posted by zander (Post 2153443)
SLI Mosaic is fully supported on Linux.

Just out of curiosity, is the composite extension fully supported on QuadroPlex?
What I means is: does Compiz work on QPlex with four/six/eight DVI outputs?

TIA and best regards

Bernhard

zander 12-30-09 01:02 PM

Re: 4K in Linux?
 
Yes, the COMPOSITE extension should work fine, since SLI Mosaic configurations are exposed as single X screens.

JaXXoN 12-30-09 01:42 PM

Re: 4K in Linux?
 
Quote:

Originally Posted by zander (Post 2154043)
Yes, the COMPOSITE extension should work fine, since SLI Mosaic configurations are exposed as single X screens.

Good to know, thanks!

Bernhard

mooninite 12-30-09 02:21 PM

Re: 4K in Linux?
 
I think Linux nerds everywhere would crap their pants if they saw a compiz desktop cube rotating on this 4k projector and two nVidia cards. :)

jesmith, would you be able to record (even if SD) video of this project and post it on youtube? It sounds very interesting. By video I mean from a hand-held camcorder, not a screen capture from the projector itself.

bwheaton 12-30-09 04:51 PM

Re: 4K in Linux?
 
Quote:

Originally Posted by JaXXoN (Post 2153857)
I didn't checked in full detail, but the available documentation of the
beamer didn't state that it is required to have the signals in sync.

I suppose that's possible, but wouldn't help - the projector will have one consistent 'frame' on the panel, and if it grabbed a different frame (in time) in any quadrant, then you would see the join very, very clearly.

Bruce


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