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Old 09-27-10, 12:59 PM   #1
jgeboski
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Question Multi-Monitor/GPU Compositing

Hello all,

I currently run a quad monitor array two monitors on each GPU(2x Nvidia 8800 Ultras). I run my setup using Xinerama with independent x screens. I have recently gotten a bug in my ass to get compiz working. That obviously requires compositing to be enabled which Xinerama disables. There use to be a way a while back to use XGL to get this to work, however, development was stopped on that a while back. There is now AIGLX which, according to reading, NVIDIA's proprietary drivers have their own implementation of it. I read someone a few months ago there is a way to tie together two GPUs running TwinView using randr. It would work as I could use Fake Xinerama but, I've also read that there isn't even multi-GPU support in randr yet as of 1.3. If someone could confirm this method that would be great.

If anyone has ideas, infomation, and/or comments please post.

James
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Old 09-28-10, 07:54 PM   #2
JaXXoN
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Default Re: Multi-Monitor/GPU Compositing

Quote:
Originally Posted by jgeboski View Post
I read someone a few months ago there is a way to tie together two GPUs running TwinView using randr.
My understanding is that many people think that xrandr might be a cure
for the xinerama/composite issue, but according to the following link, this
is not the case:
http://www.nvnews.net/vbulletin/show...8&postcount=15

My understanding is that for multi-GPU setups, xrandr would work in addition
to xinerama and could then provide the desired screen infos when using
twinview. (Means, with two GPUs, where each is setup in twinview mode, you
could probably use xrandr to determine the screen geometry to be told
to applications rather than using the current hackish fakerama-solutions).

Anyway are you using a 2x2 or a 4x1 setup for your LCDs and what's the
resolution of each of your LCDs? Depending on your requirements, one
or two TH2Gs might do it. However, those are not exactly cheap.

regards

Bernhard
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Old 09-29-10, 09:47 AM   #3
jgeboski
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Default Re: Multi-Monitor/GPU Compositing

JaXXoN,

Many thanks for the reply. I'm running them in a 2x2 setup at 1680x1050. I'm not really looking to buy new hardware but, rather a software solution if one exist at this point in time.

Again, many thanks for the reply JaXXoN,
James
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Old 09-29-10, 09:49 AM   #4
Azelphur
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Default Re: Multi-Monitor/GPU Compositing

I'd love a solution to this too, I'm on a 4x1 setup and currently running dual twinview. TH2G isn't really an option as I use the setup for compiz and gaming. Would really love to get some triple head gaming going on.
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Old 09-29-10, 11:12 AM   #5
JaXXoN
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Default Re: Multi-Monitor/GPU Compositing

Quote:
Originally Posted by Azelphur View Post
I'd love a solution to this too, I'm on a 4x1 setup and currently running dual twinview. TH2G isn't really an option as I use the setup for compiz and gaming. Would really love to get some triple head gaming going on.
What are the resolutions of your LCDs? If they are all 1680x1050, then
you can connect one LCD to the first DVI output of your video card and the
other three LCDs to the second DVI through the TH2G. If all your LCDs are 1920x1200,
then you need two TH2G running in dual head mode (two LCDs connected to the
first DVI output via one TH2G and the other two LCDs connected to the second
DVI via another TH2G).

regards

Bernhard
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Old 09-29-10, 11:29 AM   #6
JaXXoN
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Default Re: Multi-Monitor/GPU Compositing

Quote:
Originally Posted by jgeboski View Post
I'm not really looking to buy new hardware but, rather a software solution if one exist at this point in time.
So there are only two options: try to get XGL running or you could kindly ask
nvidia to provide SLI Mosaic for their consumer cards.

regards

Bernhard
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Old 09-29-10, 12:17 PM   #7
jgeboski
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Default Re: Multi-Monitor/GPU Compositing

JaXXoN,

I had saw this SLI Mosaic thing while i was googling around. It seems it would do what I want, but as you said there is no support for my cards, only the Quadro series. Do you know if it's possible to do this on SLI capable system if the drivers had the capability or are there hardware limitations on the GPUs that wouldn't allow this? Also, do you know if there are any plans of implementing for my card series?

Thanks again for the reply,
James
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Old 09-29-10, 01:21 PM   #8
JaXXoN
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Default Re: Multi-Monitor/GPU Compositing

Quote:
Originally Posted by jgeboski View Post
Do you know if it's possible to do this on SLI capable system if the drivers had the capability or are there hardware limitations on the GPUs that wouldn't allow this?
My understanding is that this is a intentional software limitation (in order
to separate the professional product line from the consumer cards).
Please note that SLI Mosaic has just recently been opened for Quadro
cards and it was only available to even more expensive QuadroPlex
boxes, before.

Quote:
Originally Posted by jgeboski View Post
Also, do you know if there are any plans of implementing for my card series?
I have no information on this topic, but I assume that SLI Mosaic is not
going to be available for consumer cards any time soon.

regards

Bernhard
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