[Nouveau] Problems with dual head on NVidia Quadro NVS 295

[Ben Skeggs]

On Mon, 2010-09-20 at 18:21 +0300, Stefan Mathe wrote:
> Hello,
> 
> I'm having problems configuring the dual-head display using an NVidia
> Quadro NVS 295 display card. It uses two identical LCD monitors (model
> HP LP2475w), connected using DP cables. If I connect one single monitor
> (either to the DP-1 or to the DP-2 output), the desktop shows up
> correctly. If I connect both monitors, only the left monitor shows the
> image, and the desktop is extended as if the second monitor were showing
> something. But the right monitor remains blank.
This is expected.  Nouveau can't fully program a native DP output on its
own yet, and relies on assistance from the video BIOS.  As such, only
displays which have previously been initialised by the VBIOS will work.

Ben.
> 
> I am using OpenSUSE 11.3, with the nouveau drivers included in its
> kernel (kernel version 2.6.34). The relevant parts of xorg.conf.d are:
> 
> Section "Device"
>   Identifier "Default Device"
>   Option "SWcursor" "true"
>   Option "monitor-DP-1" "LeftMonitor"
>   Option "monitor-DP-2" "RightMonitor"
> EndSection
> 
> Section "Monitor"
>   Identifier "LeftMonitor"
>   Option "PreferredMode" "1920x1200"
> EndSection
> 
> Section "Monitor"
>   Identifier "RightMonitor"
>   Option     "RightOf" "LeftMonitor"
>   Option     "PreferredMode" "1920x1200"
> EndSection
> 
> Section "Screen"
>   Identifier "Default Screen"
>   Device "Default Device"
>   Monitor "LeftMonitor"
>   DefaultDepth 24
>   SubSection "Display"
>      Depth 24
>      Virtual 3840 1200
>   EndSubSection
> EndSection
> 
> Section "ServerLayout"
>   Identifier "Layout0"
>   Screen 0 "Default Screen" 0 0
> EndSection
> 
> Note that I had to set the mouse cursor to software rendering because it
> was not showing up at all when using hardware rendering (cursor was
> entirely invisible but the mouse was operational).
> 
> The output of the "xrandr" command is:
> 
> Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 8192 x 8192
> DP-1 connected 1920x1200+0+0 (normal left inverted right x axis y axis)
> 546mm x 352mm
>    1920x1200      60.0*+   59.9 
>    1920x1080      60.0 
>    1600x1200      60.0 
>    1680x1050      60.0 
>    1600x1000      60.0 
>    1280x1024      75.0 
>    1280x960       60.0 
>    1152x864       75.0 
>    1024x768       75.1     60.0 
>    832x624        74.6 
>    800x600        75.0     60.3 
>    640x480        75.0     60.0 
>    720x400        70.1 
> DP-2 connected 1920x1200+1920+0 (normal left inverted right x axis y
> axis) 546mm x 352mm
>    1920x1200      60.0*+   59.9 
>    1600x1200      60.0 
>    1680x1050      60.0 
>    1600x1000      60.0 
>    1280x1024      75.0 
>    1280x960       60.0 
>    1152x864       75.0 
>    1024x768       75.1     60.0 
>    832x624        74.6 
>    800x600        75.0     60.3 
>    640x480        75.0     60.0 
>    720x400        70.1 
> 
> I have also attached my Xorg.0.log file.
> 
> Many thanks in advance for the help,
> Stefan.
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