Nouveau - Jul 2011 - [Bug 39099] New: two graphic cards and four monitors with Nouveau

https://bugs.freedesktop.org/show_bug.cgi?id=39099

           Summary: two graphic cards and four monitors with Nouveau
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: 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


This bug is related to: https://bugs.freedesktop.org/show_bug.cgi?id=38759
I was trying to get a 2-cards-3-monitors set-up working. I finally did it after
updating to bleeding edge X and using ZaphodHeads option.

3 monitors xorg.conf: http://wklej.org/id/555276/txt/  (working)
4 monitors xorg.conf: http://wklej.org/id/559775/txt/  (failing)
The only difference between those two configs is making use of 4th monitor.

3 monitors Xorg.0.log: http://wklej.org/id/559778/txt/ (working)
4 monitors Xorg.0.log: http://wklej.org/id/559777/txt/ (failing)

Error message: Screen(s) found, but none have a usable configuration.
After `service gdm restart` main screen blinks 5 times and goes back to
console.

Ubuntu 11.04 - Linux ubuntu 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24
UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
(this didn't work on Ubuntu 10.10 either)

Packages version:
libdrm-nouveau1a 2.4.26+git20110604.6dd804c5-0ubuntu0sarvatt~natty
xserver-xorg-video-nouveau 1:0.0.16+git20110623.ab89aa02-0ubuntu0sarvatt~natty
(from https://launchpad.net/~xorg-edgers/+archive/ppa)

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--- Comment #1 from Damian Nowak <nowaker at geozone.pl> 2011-07-09
15:31:33 PDT ---
Some need insights, thanks to pq from #nouveau irc channel.

4 monitors work when using a 3-monitors setup - the third and fourth monitor
display the same picture (clone). What's interesting - this shouldn't
happen as
ZaphodHeads is set. Maybe it's a bug that makes ZaphodHeads work on the
first
graphic card only?

Here's xrandr output for each screen. http://wklej.org/id/559818/txt/
(I had to disable Xinerama for a while to get the xrandr output)

3-monitors xorg.conf: http://wklej.org/id/555276/txt/

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--- Comment #2 from Damian Nowak <nowaker at geozone.pl> 2011-07-09
15:33:12 PDT ---
s/need insights/new insights/

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Damian Nowak <nowaker at geozone.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         OS/Version|All                         |Linux (All)

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--- Comment #3 from Damian Nowak <nowaker at geozone.pl> 2011-07-09
16:49:37 PDT ---
I tried combining ZaphotHeads on the first card and use one virtual-sized
Screen on the second card. http://wklej.org/id/559842/

As long as I have Xinerama off, it works. I get 3 independent X screens on four
monitors.

However, when I enable Xinerama, the strange behaviour from my first bug report
appears. The video is there. https://bugs.freedesktop.org/show_bug.cgi?id=38759


So there are two alternative ways of resolving the issue:

- fix ZaphodHeads work on two cards, four monitors
- fix the strange behaviour from the video when using virtual screens
- ...or tell me what I did wrong in xorg.conf so I get the error message:
  Screen(s) found, but none have a usable configuration.
  It's the preferred way. :)

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--- Comment #4 from Emil Velikov <emil.l.velikov at gmail.com> 2011-07-11
12:45:30 PDT ---
Created an attachment (id=48986)
 View: https://bugs.freedesktop.org/attachment.cgi?id=48986
 Review: https://bugs.freedesktop.org/review?bug=39099&attachment=48986

debug output

Can you please try the patch on a 3 and 4 monitor setup and attach the Xorg.log

My best guess is that the total number of monitors is limited to the number of
connectors on the primary card

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--- Comment #5 from Damian Nowak <nowaker at geozone.pl> 2011-07-18
12:46:33 PDT ---
I git pulled the drivers and applied your patch. Apparently it works - although
your patch prints debug info only, you say.

21:03 < Nowaker> xexaxo: your patch made those four monitors working :)
21:04 < Nowaker> xexaxo: sorry for testing it out so late but I played
OpenTTD
with my friends for three days in a row, and then got some work to do
21:10 < xexaxo> Nowaker: the patch or the configuration ?
21:10 < xexaxo> the patch only added some debug output
21:11 < Nowaker> xexaxo: the patch
21:11 < Nowaker> xexaxo: so someone fixed the issue in meantime on git
21:12 < Nowaker> I'm just uploading the logs
21:12 < xexaxo> Nowaker: can  you make sure that it's the patch, and
try
attaching the Xorg.log with/wo the patch (3 and 4 monitors please)

http://wklej.org/id/563568/txt/ - git+patch - 3-setup (working)
http://wklej.org/id/563558/txt/ - git+patch - 4-setup (working)

After `git reset --hard`

http://wklej.org/id/563575/txt/ - git - 3-setup (working)
http://wklej.org/id/563572/txt/ - git - 4-setup (failing the same way)

Looks like you really fixed it:

+        if (!IsShared || ScreenEq ) // <- this!
             drmmode_crtc_init(pScrn, drmmode, i);

I made sure it's you who fixed the problem - twice. ;)

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #48986|0                           |1
        is obsolete|                            |

--- Comment #6 from Emil Velikov <emil.l.velikov at gmail.com> 2011-07-18
16:05:38 PDT ---
Created an attachment (id=49279)
 View: https://bugs.freedesktop.org/attachment.cgi?id=49279
 Review: https://bugs.freedesktop.org/review?bug=39099&attachment=49279

Final patch

I was not able to oversee the issue while creating the initial patch
The issue lies within a missing (or actually 3) brackets, causing incorrect
argument to the function xf86IsEntityShared()

It must be 
* xf86IsEntityShared(pScrn->entityList[0])
while currently it is
* xf86IsEntityShared(pScrn->entityList[0] ||
pScrn->confScreen->device->screen
== i)

Please test
Emil

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--- Comment #7 from Emil Velikov <emil.l.velikov at gmail.com> 2011-07-18
16:32:15 PDT ---
Created an attachment (id=49281)
 View: https://bugs.freedesktop.org/attachment.cgi?id=49281
 Review: https://bugs.freedesktop.org/review?bug=39099&attachment=49281

Fix yet another silly typo

I've added a bit too many brackets
It should be finally resolved

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

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

--- Comment #8 from Emil Velikov <emil.l.velikov at gmail.com> 2011-07-19
10:36:59 PDT ---
Latest patch resolves the issue and has been upstreamed

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--- Comment #9 from Damian Nowak <nowaker at geozone.pl> 2011-07-19
11:38:02 PDT ---
Yep, working!

OpenTTD on four screens: http://upload.nowaker.net/nwkr/4-monitory.jpg
However, this is a fake photo. The game is not playable - looks like ~~20 fps.
;)

Thanks for fixing the issue.

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