This is a NVIDIA driver bug, but it is only something that NVIDIA claims
will be fixed at some indeterminate future date. In the meantime,
upstream gnome has applied a workaround (to 3.16.1, I think, but didn't
make it into 3.16.0) for this, referenced in
https://bugzilla.gnome.org/show_bug.cgi?id=739178 that basically forces
a refresh of background instances during resume.
The two patches attached to that bug report apply to mutter (the
"meta-background" patch) and gnome-shell (the "Refresh all background"
patch), and apply cleanly to the 3.14 versions of those packages
currently in testing.
I applied the patches, rebuilt mutter and gnome-shell, and the problem
is gone: suspend and resume now work without any lock and desktop
background garbling.
Jason Rhinelander
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