Nouveau - Jul 2012 - [Bug 51798] New: Cannot enable second video card on nvidia quadro NVS420

https://bugs.freedesktop.org/show_bug.cgi?id=51798

             Bug #: 51798
           Summary: Cannot enable second video card on nvidia quadro
                    NVS420
    Classification: Unclassified
           Product: xorg
           Version: 7.7 (2011)
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: ilyin at aip.de
         QAContact: xorg-team at lists.x.org


Created attachment 63903
  --> https://bugs.freedesktop.org/attachment.cgi?id=63903
lspci

With nouveau module I can only see two monitors working which are connected to
the first video card out of two cards of NVS420, connected via PCI bridge
pci 03:00 and 04:00:

-[0000:00]-+-00.0  Intel Corporation 4 Series Chipset DRAM Controller
           +-01.0-[01-04]----00.0-[02-04]--+-00.0-[03]----00.0 G98 Quadro
NVS420
           |                               \-02.0-[04]----00.0 G98 Quadro
NVS420

Full list of PCIs are in the attachment.

DRI status is given here and shows that the second video card (card1) is not
set to any PCI bus: 

dristat -a

/dev/dri/card0
  Busid: pci:0000:03:00.0
  Version information:
    Name: nouveau
    Version: 1.0.0
    Date: 20120316
    Desc: nVidia Riva/TNT/GeForce
  VM map information:
  flags: (R)estricted (r)ead/(w)rite (l)ocked (k)ernel (W)rite-combine (L)ock:
    slot     offset       size type flags    address mtrr
       0 0x11839000 0x00002000 SHM  w   L 0x1b7ff000 none
  DRI client information:
    a   pid   uid      magic     ioctls   prog
    y  1482     0          0          7   dristat
    y   761     0          0       3824   /usr/bin/Xorg
  System statistics:
    Lock                 0x00000000
    Opens                         2
    Closes                        1
    Ioctls                     3834
    Locks                         0
    Unlocks                       0

/dev/dri/card1
  Busid: (not set)
  Version information:
    Name: nouveau
    Version: 1.0.0
    Date: 20120316
    Desc: nVidia Riva/TNT/GeForce
  VM map information:
  flags: (R)estricted (r)ead/(w)rite (l)ocked (k)ernel (W)rite-combine (L)ock:
    slot     offset       size type flags    address mtrr
  DRI client information:
    a   pid   uid      magic     ioctls   prog
    y  1482     0          0          6   dristat
  System statistics:
    Lock                 0x00000000
    Opens                         0
    Closes                        0
    Ioctls                        8
    Locks                         0
    Unlocks                       0




Though all the DisplayPorts are connected:

ls /sys/class/drm/*/status | xargs -I {} -i bash -c "echo -n {}: ; cat
{}"

/sys/class/drm/card0-DP-1/status:connected
/sys/class/drm/card0-DP-2/status:connected
/sys/class/drm/card1-DP-3/status:connected
/sys/class/drm/card1-DP-4/status:connected

BUT

ls /sys/bus/pci/devices/*/drm/*/card*/enabled | xargs -I {} -i bash -c
"echo -n
{}: ; cat {}"

/sys/bus/pci/devices/0000:03:00.0/drm/card0/card0-DP-1/enabled:enabled
/sys/bus/pci/devices/0000:03:00.0/drm/card0/card0-DP-2/enabled:enabled

/sys/bus/pci/devices/0000:04:00.0/drm/card1/card1-DP-3/enabled:disabled
/sys/bus/pci/devices/0000:04:00.0/drm/card1/card1-DP-4/enabled:disabled

i.e. the last two ports of card1 are disabled.

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https://bugs.freedesktop.org/show_bug.cgi?id=51798

--- Comment #1 from Ilya Ilyin <ilyin at aip.de> 2012-07-06 12:39:37 PDT
---
Created attachment 63904
  --> https://bugs.freedesktop.org/attachment.cgi?id=63904
kernel messages on drm

Kernel drm messages for the two PCI 03 and 04 are rather the same.

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https://bugs.freedesktop.org/show_bug.cgi?id=51798

--- Comment #2 from Ilya Ilyin <ilyin at aip.de> 2012-07-06 12:49:14 PDT
---
Created attachment 63905
  --> https://bugs.freedesktop.org/attachment.cgi?id=63905
Xorg log

As the result, X server opens only the first two monitors of card0. Any
experiments without xorg.conf or with it have no positive outcome: the last two
monitors are always blank as disabled.

With the commercial nvidia driver everything works from a scratch on four
displays as one long screen with Xinerama extension, but it has no proper ARGB
support for Quardro NVS.

How to enable /dev/dri/card1? Is there another way for manual tuning with KMS?
I tried video=DP-1:e video=DP-2:e video=DP-3:e video=DP-4:e, but the result is
the same.

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Ilya Ilyin <ilyin at aip.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|medium                      |high

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu>
---
> ls /sys/bus/pci/devices/*/drm/*/card*/enabled | xargs -I {} -i bash -c
"echo -n {}: ; cat {}"
Here's a neat trick:

grep . /sys/bus/pci/devices/*/drm/*/card*/enabled

I think "enabled" is like "is there a KMS user that has enabled
this connector"
(probably something to do with assigned crtc's or who knows). e.g. Xorg.
Looking at your xorg log, it only loads for the first gpu. Do you have an
xorg.conf that hardcodes the busid?

In any case, I'd highly recommend retesting with a new kernel and
xf86-video-nouveau (and maybe xorg-server).

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--- Comment #4 from Emil Velikov <emil.l.velikov at gmail.com> ---
(In reply to comment #3)
Slight improvement of Ilia's trick

grep . /sys/bus/pci/devices/*/drm/*/card*/{status,enabled}
> I think "enabled" is like "is there a KMS user that has
enabled this
> connector" (probably something to do with assigned crtc's or who
knows).
I think so too,
* status indicates if there is a connection (cable is plugged)
* whereas enabled - if the output enabled/is there a user that has enabled
> e.g. Xorg. Looking at your xorg log, it only loads for the first gpu. Do
you
> have an xorg.conf that hardcodes the busid?
> 
Indeed, I was wondering why nouveau is loaded only once by X

A minimal xorg.conf like the following should do the job

Section "Device"
    Identifier  "Device0"
    Driver      "nouveau"
    # Actual PCI location of first card/gpu
    BusID       "PCI:3:0:0"
EndSection

Section "Device"
    Identifier  "Device1"
    Driver      "nouveau"
    # Actual PCI location of second card/gpu
    BusID       "PCI:4:0:0"
EndSection

Additionally if you're planning to use three or more outputs you might want
to
setup xinerama/zaphod heads [1]
> In any case, I'd highly recommend retesting with a new kernel and
> xf86-video-nouveau (and maybe xorg-server).
Seconded


[1] http://nouveau.freedesktop.org/wiki/MultiMonitorDesktop/

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--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
BTW2: It has been noticed that the second gpu's outputs are not going to be
enabled since 3.7 unless you use nouveau.modeset=1. This will hopefully be
fixed in a future kernel though. When re-resting, please use that option on the
kernel commandline. Lastly, a fix went into xf86-video-nouveau 1.0.8 for a bug
that caused the second GPU to never be used by X on those cards, so make sure
you upgrade to at least that version.

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--- Comment #6 from Ilya Ilyin <ilyin at aip.de> ---
Thanks for your comments: I was certainly playing with xorg.conf with the
explicit specification of the BusID for each Device, but with no avail.

But the good or bad news is that our NVS420 device is ceased to exist any
longer: its cooling fun jammed, and it was burned up to 98C, then failed to
function properly even with two screens. We have replaced it with another dual
video port card, so that this case is closed for me so far, but your comments
would be useful for other people having a similar problem.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

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

--- Comment #7 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Sorry to hear the card died. Marking as invalid since the original owner no
longer has the hardware.

Note that Kepler cards (nve0+) have 4 CRTC's on one GPU, and the current
linux
stack is a whole lot better at supporting a single GPU with multiple screens
than multiple GPUs with multiple screens.

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