Bug#683726: closed by Julien Cristau ( Bug#683726: additional info)
I will remove the nvidia driver and retest everything under nouveau.
However I have little hope that it will work, since prior to installing
nvidia I had tested nouveau extensively: suspend-resume had never worked
under the open-source driver.
This bug is quite likely related to the graphic card restarting into a broken
state, and this of course due to the nvidia driver, except it used to work
fine with the previous kernel revision, so apparently it is some change in
the kernel which causes a regression in this interaction.
If anything interesting turns out with the nouveau driver, I'll report it here.
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