A couple of points 

>> Check the temperature of the card too.  Try and see if increasing the load
>> on it can trigger the condition.  Also compare the cards diagnostics in
>> Linux and Windows.

>I can do the first two, but not the third (no Windows around here).

>nouveau-pci-4000
>Adapter: PCI adapter
>temp1:        +81.0°C  (high = +100.0°C, crit = +120.0°C)

>That's with the machine mostly idle.

As far as I am concerned that temps way to high for an idle video card, if 
its the cards real temp. Next time you turn the system on try to read the 
temp as soon as possible to see if starts out near room temp. Even being 
pushed with a lot of 3D work the temps on my system, video card being a 
Radeon 5870, rarely exceed 65 degrees C.
If the temp is real may be the card has an air flow restriction, say to 
many cables around the place, or if it has a fan it requires cleaning and a 
drop of oil. 

Second point may be minor, I am slightly suspicious of the monitor not 
coming back after being switched off and on. I have struck some older 
monitors that will not sync to a high resolution signal when restarted but 
it would be rare these days. 

Using Linux now for a few months under twenty years,
Lindsay
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