Nouveau - Jun 2011 - [Bug 38759] New: three monitors, two graphic cards and Xinerama - almost working

https://bugs.freedesktop.org/show_bug.cgi?id=38759

           Summary: three monitors, two graphic cards and Xinerama -
                    almost working
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: nowaker at geozone.pl
         QAContact: xorg-team at lists.x.org


My goal is to achieve one huge X screen on three monitors and two graphics
cards. I got a working solution without Xinerama (one X screen on front+right
and one X screen on the left) but this of course won't let me drag the
windows.
Enabling Xinerama makes something really strange to the right monitor, just see
the video: http://upload.nowaker.net/nwkr/xinerama-fail.3gp As you can see,
it's almost working. 

lspci:
01:00.0 VGA compatible controller: nVidia Corporation G73 [GeForce 7600 GT]
(rev a1)
07:01.0 VGA compatible controller: nVidia Corporation NV44A [GeForce 6200] (rev
a1)
(PCI-E x16 and old 32-bit PCI)

My xorg.conf: http://wklej.org/id/554292/txt/

Using Ubuntu 10.10, amd64.
Nouveau package version 2.4.21-1ubuntu2.1.

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https://bugs.freedesktop.org/show_bug.cgi?id=38759

--- Comment #1 from Pekka Paalanen <pq at iki.fi> 2011-06-29 08:51:23 PDT
---
Have you tried if you have any better luck with ZaphodHeads?

http://nouveau.freedesktop.org/wiki/MultiMonitorDesktop

The option is listed in the nouveau man page, but unfortunately I do not have
an actual example to show. It would be configured like the "classic"
separate-SCREEN dual-head, added with ZaphodHeads options.

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--- Comment #2 from Damian Nowak <nowaker at geozone.pl> 2011-06-29
12:46:24 PDT ---
Thanks for your suggestion. I will google for ZaphodHeads examples and give it
a try.

In meantime, let me provide some new insights.

Just after X start:
http://upload.nowaker.net/nwkr/dualcard-xinerama-after-startup.jpg As you can
see, everything looks OK! (I don't care the window popping up in the middle
of
two monitors) When I move the pointer on the front screen or left screen,
everything is still OK. When I move the pointer back to the right screen, the
story from the last video begins. Have a look:
http://upload.nowaker.net/nwkr/dualcard-xinerama-fail-2.3gp

I believe something trivial is broken here. It's almost working - starts OK
but
moving a pointer to the right screen starts the fail story.

I will also take a look at the source - but I won't be too optimistic as I
am a
Java developer and don't really know the X or Linux stuff.

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--- Comment #3 from Damian Nowak <nowaker at geozone.pl> 2011-06-30
14:38:15 PDT ---
@Pekka, thanks for your suggestion. I first tried ZaphodHeads but got a message
in Xorg.0.log that driver doesn't understand it. I updated all X-related
packages to the newest versions from
https://launchpad.net/~xorg-edgers/+archive/ppa and apparently it works.

The strange thing you saw on the video is gone.
I saw it just once - maybe for 5 seconds - after a day-long work.
That's acceptable. :)

My xorg.conf: http://wklej.org/id/555276/txt/
You may update your instructions at
http://nouveau.freedesktop.org/wiki/MultiMonitorDesktop
I wrote it from scratch as I didn't find any examples on the Internet.

In my case, three Xineramed screens, nouveau > nvidia in terms of
performance.

Windows maximizing works correctly.

More about my system:
libdrm-nouveau1 2.4.23+git20110119.550fe2ca
xserver-xorg 1:7.5+6+xserver1.9
xserver-xorg-video-nouveau 1:0.0.16+git20110214.46acb7e0
kernel 2.6.35-30-generic
Ubuntu 10.10

---

Currently I'm not interested in 4 monitors environment but being here I just
checked it. X doesn't start. First GPUs monitors only blink several times. I
will report a new bug for this issue soon after I test more xorg.conf
variations.

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Damian Nowak <nowaker at geozone.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #4 from Damian Nowak <nowaker at geozone.pl> 2011-10-25
19:21:22 UTC ---
I changed the status to INVALID since it was already fixed on Git.

---

An already resolved four monitors problem is here:
https://bugs.freedesktop.org/show_bug.cgi?id=39099

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