My box is running now for a whole night&day without problems,
including multiple hours of active working with libreoffice writer.
Obviously this solution works:
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create folder and file /etc/X11/xorg.conf.d/20-nouveau.conf
and put in:
Section "Device"
Identifier "NvidiaCard"
Driver "nouveau"
BusID "PCI:01:00:0" # PCI bus address of the Nvidia GPU here
EndSection
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I'd recommend debian install / upgrade procedure to care for a similiar
solution, maybe adopted to the proper debianic way.
