I'm using ordinary password authentication here. This system has also
been through multiple upgrades, but I haven't upgraded to 16.04 yet. I
run Gnome 3 on another machine without this problem (but I probably get
that password right more often).
Let me know if there is anything I can look up or te
Having this issue as well on 15.10.
Partial fix: After killing gnome-screensaver from a TTY, I've found that
running:
gnome-screensaver-command -a
activates the screen saver, but once unlocked, eliminates the screen-
blanking problem that Tony Maro described.
Will also try "gnome-screensave