[Nouveau] Nouveau and multi-monitor setup for Quadro NVS450 (G98)

[Dr. Boris Neubert]

Hi,

I have a NVidia Quadro NVS450 graphics card with on screen (4800 x 1200
pixels) over three monitors. I use the proprietary NVidia modules to
achieve accelerated 2D graphics and display effects.

Since about the beginning of 2014, probably related to changes in the
X11 or compositing manager, I experience screen lockups lasting from few
seconds to several minutes. I therefore would like to move to the
Nouveau driver which has become the default for most Linux distributions
anyway.

I am not able to create a multi-monitor setup with current Nouveau
drivers (from Ubuntu 14.04.1). xrandr -q only shows one monitor.
http://nouveau.freedesktop.org/wiki/MultiMonitorDesktop/ seems to refer
to Xinerama which is no alternative to me (slow, no display effects).

If I am not mistaken, the NVS450's chipset G98 is not supported
according to the feature matrix
http://nouveau.freedesktop.org/wiki/FeatureMatrix although certain other
sources from the web state otherwise. I did some extensive search on the
web to see if anybody had managed to create a three-monitor setup with
accelerated 2D graphics and display effects with no result.

Thus the question: is this possible, and if yes, what do I need to do?

Kind regards
Boris