I followed different strategies suggested in Ubuntu and Mint forums with a little success. Then I found the page https://help.ubuntu.com/community/Binar ... wto/Nvidia and the suggested edit of xorg.conf plus blacklist.conf resolved the issue for me. No more freezes. Apparently, when resuming from suspend confusion can arise and the wrong drivers can be activated.
Two weeks ago my hardware self-destructed so I upgraded to an i5 on a new motherboard including some new intel video capability. This week I noticed the screen freeze again. After mastering:
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~/ lspci | grep VGA ... to see the pci controllers
~/ cat /var/log/Xorg.0.log |less ... the log
~/ sudo lshw | less ... the current view
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blacklist intel_agp
blacklist nouveau
blacklist i915
Cross Posted in Ubuntu forums as well in case people with U12 are seeing the same issue.