As expected the problem is something about the interaction with the debian nvidia software, gdm, and my laptop. I have found a workaround.
I did
# apt-get remove *nvidia*
And the configuration went back to the nouveau drivers, and the problem
went away.
The laptop isn't a gaming machine so I don't mind lack of graphics
acceleration. But losing CUDA parallel processing is a real problem
for me.
Anyway, I've got something that works. Next up, I'll switch to cinnamon
and see if I'm allowed to get CUDA working with that.
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