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Old 02-02-09, 10:35 PM   #1
voltaicsca
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Default More than 2 monitor support? Is it ever going to happen?

Should we ever expect to see any of the new features that are being implemented for everyone else implemented in such a way that they can be used with more than 2 monitors?

Namely, compositing support and vdpau support? (both are currently unsupported under Xinerama)

It sure would be nice to see what everyone is talking about, but I'm not going to throw away one of my monitors to do it.

[related posts]
xorg 1.6 randr 1.3
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Old 02-03-09, 01:36 AM   #2
Tub
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Default Re: More than 2 monitor support? Is it ever going to happen?

no idea about vdpau, but compositing + Xinerama is an X server limitation, not a driver problem.
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Old 02-03-09, 02:35 AM   #3
damentz
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Default Re: More than 2 monitor support? Is it ever going to happen?

RandR 1.2 or 1.3 support would be nice, then you could have as many monitors as you want and multi monitor support in KDE4 would just work.

When they dubbed the technology TwinView, they were really serious about only twin displays.
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Old 02-03-09, 03:01 AM   #4
voltaicsca
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Default Re: More than 2 monitor support? Is it ever going to happen?

Quote:
Originally Posted by Tub View Post
no idea about vdpau, but compositing + Xinerama is an X server limitation, not a driver problem.
Yes, that is true.
From what I have read and understand, Xinerama will never be the answer to this problem, it just happens to be the best solution to the problem for now.

I have heard some things about RandR 1.3 that make it seem like it could be the answer:
Quote:
When it comes to features, RandR 1.3 is most notably expected to introduce GPU object support. This GPU object support is another layer between the X screen and the CRTCs. Ultimately, this should allow multiple GPUs to be merged into a single X screen.
[article] and more recently: [article]

However, I haven't seen any indication that nvidia has any plans of implementing randr 1.3, and according to Thunderbird, about a year ago, they hadn't even fully implemented 1.2, which at that time had been out for quite a while. [post]
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Old 02-03-09, 05:49 AM   #5
DeiF
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Default Re: More than 2 monitor support? Is it ever going to happen?

I don't know what exactly you guys mean.

I have 2 monitors configured with TwinView and I can use compositing, vdpau, etc. just fine.
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Old 02-03-09, 05:58 AM   #6
adamk75
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Default Re: More than 2 monitor support? Is it ever going to happen?

The OP specifically asked about more than 2 monitors, which suggests multiple video card. twinview can't be used with monitors on multiple video cards.

Adam
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Old 02-03-09, 08:34 AM   #7
dillzz
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Default Re: More than 2 monitor support? Is it ever going to happen?

voltaicsca:

It would be nice to see some of the features you discuss and be on on par with single GPU. Its a shame to see such good hardware perform so poorly: Two nvidia cards 9600gt's, 3 24" monitors, quad core, 8 gig ram. I have mentioned in other threads that I tested this exact setup in windows and 2d/3d works flawless.
AMD released multiview for linux a while back:
http://www.phoronix.com/scan.php?pag...ultiview&num=1

At least someone is looking at the issue and trying to resolve it. I have not tested it since we bailed at work on all things ATI. Now we are going to have to look at different options perhaps for future projects if multihead does not get resolved. We used to use accelerated X. I sure hope nvidia helps all of us out.
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Old 02-03-09, 09:38 AM   #8
JaXXoN
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Default Re: More than 2 monitor support? Is it ever going to happen?

Quote:
Originally Posted by dillzz View Post
3 24" monitors
BTW.: there's a new firmware for TH2G that now allows 3x 1920x1200@60Hz off
one card! I have attached a tested xorg.conf. I know you don't like TH2G, but it's
the only viable solution for the time being, IMHO. With two TH2Gs you can even
have up to 5040x2100 (2x 3x 1680x1050, tested) or 4x 1920x1200 (not tested).

regards

Bernhard
Attached Files
File Type: txt xorg.conf-5760x1200-twinview.txt (2.7 KB, 152 views)
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Old 02-03-09, 11:31 AM   #9
dillzz
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Default Re: More than 2 monitor support? Is it ever going to happen?

JaXXon:

I guess you have read some of my other posts regarding TH2G, haha. It's not that I don't like it, I just want to be able to utilize my hardware. I am disturbed that it works in windows and not in linux. If it didn't work on either platform I would feel a lot better.

As far as that setup. You have a pretty beefy card. I have a (2) leadtek 9600GT's with 512mb of ram. I am unsure if 1 card will power all three monitors with composite WM. Is this firmware update officially announced? How does your WM like this? benefits of xinerama with placement etc. Thanks in advance. . .

-Dillzz
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Old 02-03-09, 01:00 PM   #10
xianthax
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Default Re: More than 2 monitor support? Is it ever going to happen?

Quote:
Originally Posted by dillzz View Post
JaXXon:

I guess you have read some of my other posts regarding TH2G, haha. It's not that I don't like it, I just want to be able to utilize my hardware. I am disturbed that it works in windows and not in linux. If it didn't work on either platform I would feel a lot better.

As far as that setup. You have a pretty beefy card. I have a (2) leadtek 9600GT's with 512mb of ram. I am unsure if 1 card will power all three monitors with composite WM. Is this firmware update officially announced? How does your WM like this? benefits of xinerama with placement etc. Thanks in advance. . .

-Dillzz
i've had 3 setups now in the last 2 weeks as parts came in to tackle your same problem:

1) 3 x screens off 2 x 8600GTS @ 1680x1050, xinerama to merge

2) same screens, through a TH2G to a single 8600gts, compiz enabled....frame rates in 3d apps jumped about 20% on average over the 2 card setup. 2D performance also improved. Window manager is perfectly fine with the setup. maximize to 1 screen, selecting full screen monitor for video, etc., just add meta modes for each screen independently.

3) switched out to a GTX260 card, hung 4th screen off the second output, so 3 screens through TH2G on one output, single screen on second, twinview to merge.

thus far the TH2G is awesome, as video cards continue to get ridiculously powerfully i hope these little splitter boxes become a lot more popular to drive the price down, cause the current $300 kinda sucks.

-xian
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Old 02-03-09, 01:24 PM   #11
JaXXoN
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Default Re: More than 2 monitor support? Is it ever going to happen?

Quote:
Originally Posted by dillzz View Post
I am disturbed that it works in windows and not in linux.
True, the situation is not nice, but there is little to nothing we can do about it!

Users complained and nvidia demonstrated willingness to implement the
required features once xorg offers a proper interface for 3D multi-GPU
multi-Screen setups. However, my understanding is that there's not much going
on. So there are two options: either fix xrandr so that nvidia can proceed
or get some additional hardware. Since i currently don't want to spend
month/years on the first variant, i decided for me to go the second route :-)

Quote:
Originally Posted by dillzz View Post
I am unsure if 1 card will power all three monitors with composite WM.
I didn't do any formal benchmarks on compiz, but it feels smooth.
With one card, you will even recognize an increase of performance,
i.e. for me, UT2004 was about 20-30% faster than with the two card
solution (2x 8800GT)

Quote:
Originally Posted by dillzz View Post
Is this firmware update officially announced?
Sure:
http://www.matrox.com/graphics/en/su...igital/howto1/

Quote:
Originally Posted by dillzz View Post
How does your WM like this?
It's a single card twinview setup - what kind of problems do you expect? :-)


Quote:
Originally Posted by dillzz View Post
benefits of xinerama with placement etc. Thanks in advance. . .
The nvidia driver has the options TwinviewXineramaInfo and TwinViewXineramaInfoOverride
so that you can define the screen boundaries as desired.

For details, you may also like to read:
http://www.nvnews.net/vbulletin/showthread.php?t=126134

regards

Bernhard
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Old 02-03-09, 01:28 PM   #12
JaXXoN
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Default Re: More than 2 monitor support? Is it ever going to happen?

Quote:
Originally Posted by dillzz View Post
Is this firmware update officially announced?
BTW.: the TH2G i purchased a couple of weeks ago didn't even required the
update - the 5040x1050 mode just worked OOTB.

regards

Bernhard
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