Nouveau - Aug 2011 - [Bug 39901] New: 4 monitors on two graphic cards GeRorce 450 does not work

https://bugs.freedesktop.org/show_bug.cgi?id=39901

           Summary: 4 monitors on two graphic cards GeRorce 450 does not
                    work
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: linux at vobornik.eu
         QAContact: xorg-team at lists.x.org


Created an attachment (id=50013)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50013)
config files, logs and pictures of configuration

Hi,
I am unable to create a working configuration with 4 monitors on 2 GeForce 450
(dual headed). I am able to make it working with 3 monitors - see
xorg.conf.tripple. The log file is xorg.0.log.tripple. The configuration works
also with Xinerama - see monitor-tripple.jpg.

When I add 4th display into the configuration (the same way as 2nd and 3rd) the
X doesn't start - see xorg.conf.quadro. No specific error message in the
system
or xorg log - see xorg.0.log.quadro.


I also tried to configure it with proprietary nvidia drivers - I can start X
with 4 separate screens, but as soon as I enable Xinerama, the desktop is
"shifted" to the most right monitor and I must click on the first
monitor to be
provided on the last one (even for two monitors) - see monitor-nvidia.jpg
(selection is on right monitor, a mouse cursor on the left one - so there is an
offset of a whole monitor). With 4 monitors the offset is 3 monitors :-( 

So, I see it as a bug that I am not able to enhance a working dual
configuration into quadro one. Neither with nvidia nor nouveau drivers. 


I have this config:

X version:
X.Org X Server 1.10.1
Release Date: 2011-04-15
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-27-server i686 Ubuntu
Current Operating System: Linux harfa 2.6.38-10-generic-pae #46-Ubuntu SMP Tue
Jun 28 16:54:49 UTC 2011 i686
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-2.6.38-10-generic-pae
root=UUID=2e66a48e-ff81-4e7f-8a24-b4f5dd2425a4 ro vmalloc=512M quiet splash
vt.handoff=7
Build Date: 21 May 2011  11:38:35AM
xorg-server 2:1.10.1-1ubuntu1.1 (For technical support please see
http://www.ubuntu.com/support) 
Current version of pixman: 0.20.2
    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.

lspci:
01:00.0 VGA compatible controller: nVidia Corporation GF106 [GeForce 450 GTS]
(rev a1)
01:00.1 Audio device: nVidia Corporation GF106 High Definition Audio Controller
(rev a1)
02:00.0 VGA compatible controller: nVidia Corporation GF106 [GeForce 450 GTS]
(rev a1)
02:00.1 Audio device: nVidia Corporation GF106 High Definition Audio Controller
(rev a1)

Regards
Vaclav

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https://bugs.freedesktop.org/show_bug.cgi?id=39901

--- Comment #1 from Emil Velikov <emil.l.velikov at gmail.com> 2011-08-07
09:28:12 PDT ---
Hi Vaclav

There was a bug [1] in xf86-video-nouveau that was causing this issue and the
patch that resolves [2] it can be found in the master branch

Can you please update/rebuild and give it a try

On top of that you can also try more minimalistic xorg.conf [1]

I hope it helps

Cheers
Emil

[1] https://bugs.freedesktop.org/show_bug.cgi?id=39099
[2]
http://cgit.freedesktop.org/nouveau/xf86-video-nouveau/commit/?id=de9d1ba7efeba64f319efa00df183d3cb78f24af

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--- Comment #2 from Vaclav <linux at vobornik.eu> 2011-08-11 12:38:38 PDT
---
Hi,
Yes, now it works. Even some active elements (like flash on websites) are
terrible slow - much more slower than with TwinView. 

Anyway, thanks a lot!
Vaclav

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Emil Velikov <emil.l.velikov at gmail.com> changed:

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

--- Comment #3 from Emil Velikov <emil.l.velikov at gmail.com> 2011-08-11
13:33:25 PDT ---
I'm not 100% sure so don't take my word for it

The reason for the slowness is because compositing/acceleration does not work
with xinerama

There has been a patch recently in the xserver that allows for xinerama to be
used in conjunction with compositing. Nevertheless there could be some bits in
nouveau that need updating

In either case you will not get any acceleration if the total resolution
exceeds 4096x4096

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