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Old 02-18-08, 08:04 AM   #1
einalex
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Default Is NVIDIA ever going to fix the xinerama + composite problems?

Hi folks,
We use (and require) a 3 monitor setups which are currently powered by two 7900gt and xinerama. Lately the need to use composite with that setup has arisen and while searching for information on the topic I came under the impression that there are xinerama + composite issues with nvidia's drivers for quite a long time now.
My question is: will these be fixed in the forseeable future or should I search for a solution somewhere else (meaning at a competitor) ? We use nvidia cards for a some time now and would like to continue doing so, but this is will be a major problem in the future.

regards, Alex
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Old 02-19-08, 03:47 AM   #2
Lithorus
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

Which composite manager do you use?

I've read that Compiz 0.7 should have more multi-display support. So are you sure that's it's not a problem in the current composite manager?
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Old 02-21-08, 01:41 PM   #3
einalex
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

I use compiz 0.6.1 I will try with 0.7 and report back.
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Old 03-28-08, 01:46 AM   #4
evanzoss
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

Any update on if the latest compiz helps? I'd really like to see compiz working on nvidia with xinerama instead of twinview (3 monitors ftw).
Thanks.
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Old 03-28-08, 10:38 AM   #5
AaronP
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

The X server doesn't support Xinerama and Composite at the same time.
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Old 03-28-08, 12:05 PM   #6
JaXXoN
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

Quote:
Originally Posted by AaronP
The X server doesn't support Xinerama and Composite at the same time.
Hi Aaron!

Can you please point me to a discussion that sheds some light on what the actual
problem with composite and xinerama is? The situation is that whenever i (briefly)
try to google something on that topic, then the only answer is "it doesn't work",
so i couldn't yet figure out what would need to be done to fix this issue. Since 3D
games work flawlessly with acceptable FPS across three LCDs at 4800x1200, i'm
wondering why composite shall be such a pain?

Having three or more displays is reeeeealy nice for work and gaming. I would
expect that more people will adopt such setups in future. Since i'm still using
the good old fvwm95 the situation is not that urgent for me: none of the modern
WM features "manual window placement".

regards

Bernhard
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Old 03-28-08, 02:32 PM   #7
AaronP
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

I know there are a few known bugs with Xinerama + Composite, but I don't know all of the details. You might try asking on the xorg mailing list.
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Old 03-28-08, 05:40 PM   #8
evanzoss
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

Hi, Thanks very much for following up.

The latest I've been able to find is this bug:
http://bugs.opencompositing.org/show_bug.cgi?id=471
Which wasn't updated for months, and then was closed saying it's a hardware/driver problem....

And this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=6501 (may be related)
Which hasn't been really been updated in a year!

If you know for sure that this is a bug in the open source code then maybe you can shed some light on where you believe it is so that some more investigation can be done?

I'm just trying to figgure out what the latest status is on this so I can pick up and see if we can't get this stuff working. I can't beileve I can't find any good updates since last November!


I guess option 2 is, make twinview work on 3 monitors any plans for that?
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Old 03-29-08, 10:44 AM   #9
Tub
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

Quote:
Originally Posted by evanzoss
I guess option 2 is, make twinview work on 3 monitors any plans for that?
That'd need a card with more than two video outputs, which are difficult to find on the consumer market.

You could also use something like the Matrox TripleHead2Go to splice a video signal onto three monitors (or rather use a DualHead2Go for two monitors and the second port for the third, to avoid bandwidth problems)

I don't know how those things work on linux though, I'd guess you'll need some manual configuration to output the correct video resolution.
Also be aware that you'll need to manually override the Xinerama boundaries.
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Old 03-29-08, 11:23 AM   #10
evanzoss
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

Ya I've looked into the Matrox boxes, it's nice, but won't work for me.. too limited in supported resolutions.

At any rate, it doesn't sound like we need anything that drastic, we just need to get our heads together and figgure out where this bug is with xinerama and composite! I'm just looking for a starting point from someone whose been involved in this much longer, since it seems like the problem's been around for a while.
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Old 03-29-08, 07:12 PM   #11
JaXXoN
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

I was also thinking of getting rid of Xinerama by using DualHead2Go:
http://www.nvnews.net/vbulletin/showthread.php?t=106517

But apart from the issues mentioned on the above linked posting,
i figured out in the mean time that the DH2G Digital Edition box only
has a VGA input. Even if the box would be all DVI, you might
loose performance, because Xinerama actually scales pretty well:
for example a glxgears window of size 3200x1200 has about
880 FPS when it is fully placed on a 3200x1200 twinview screen
(the left and the middle LCD in my setup). When moving the
glxgears windows so that it covers the middle and the right
LCD (driven by different video cards), then the frame rate increases
to 1640 FPS!

Also, i'm seriously considering purchasing six LCDs (3x2 setup),
so a single card solution for sure wouldn't work :-)

regards

Bernhard
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Old 06-17-08, 08:58 AM   #12
JaXXoN
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Default Re: Is NVIDIA ever going to fix the xinerama + composite problems?

Quote:
Originally Posted by evanzoss View Post
Ya I've looked into the Matrox boxes, it's nice, but won't work for me.. too limited in supported resolutions.
Just stumbled of this thread, again: which resolution do you need?
With DH2G/TH2G, you can have up to 4800x1200 (or even
5760x1080 but didn't tried that). For details, please check:
http://www.nvnews.net/vbulletin/show....php?p=1684225

Bernhard
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