[Bug 51798] Cannot enable second video card on nvidia quadro NVS420

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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

--- Comment #4 from Emil Velikov <emil.l.velikov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(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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