(In reply to Ben Skeggs from comment #41)
> Another interesting experiment would be for someone hitting this to:
> 
> - Boot with "nouveau.modeset=0 3" on the kernel commandline.
> - Suspend the machine with "echo mem > /sys/power/state"
> - Resume the machine (there will be no display at this point, so you'll need
> ssh access or to type the rest blindly)
> - Execute "modprobe nouveau modeset=1" and see if the situation is any
> better.

Before suspending, also run "modprobe -r nouveau" ;)  (Thanks Ilia!)