[Nouveau] [Bug 27455] dualhead not working, second display always black

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27455

--- Comment #8 from Jaromír Cápík <jcapik at redhat.com> 2011-06-07 06:05:37 PDT ---
Hello guys.

We experienced a similar issue with the following card:

0f:00.0 VGA compatible controller: nVidia Corporation G96 [Quadro FX 380] (rev
a1) (prog-if 00 [VGA controller])

When we use 2 displays with resolution 1920x1080, then the second screen is
always black (led blinking -> off or no signal?) even if xrandr says that both
monitors are on. What's strange ... It seems that both desktops are always on
the same absolute position (even if we tried to set the position to
left-of/right-of/... or by specifying the coordinates)

The same result with combination of 1920x1080 and 1680x1050 ...

When we use 1 display with resolution 1680x1050 and second display with
resolution 1280x1024 (via DVI-I to DSUB converter), then dual head works
without problems.

Binary drivers can handle all combinations without problems, therefore it
doesn't look like a hardware limitation.

Attaching the xrandr output of the working combination:
--------------------------------------------------------
    Screen 0: minimum 320 x 200, current 2960 x 1050, maximum 8192 x 8192
    DVI-I-1 connected 1680x1050+1280+0 (normal left inverted right x axis y
axis) 459mm x 296mm
    1680x1050 59.9*+
    1280x1024 75.0 60.0
    1440x900 75.0 59.9
    1280x960 60.0
    1280x800 59.8
    1152x864 75.0
    1280x720 50.0 60.0
    1024x768 75.1 70.1 60.0
    832x624 74.6
    800x600 72.2 75.0 60.3 56.2
    720x576 50.0
    720x480 59.9
    640x480 72.8 75.0 66.7 60.0
    720x400 70.1
    DVI-I-2 connected 1280x1024+0+0 (normal left inverted right x axis y axis)
338mm x 270mm
    1280x1024 60.0*+ 75.0
    1152x864 75.0
    1024x768 75.1 60.0
    800x600 75.0 60.3
    640x480 75.0 60.0
    720x400 70.1 
--------------------------------------------------------

I'm willing to provide You with any debug information You need.

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