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After 15 minutes, my display correctly goes to screensaver mode (Photos, Wait: 15min, "On resume, display logon screen"). If I press a key or move the mouse, the screensaver correctly halts and I get the login screen to enter my password.
However, it doesn't always work. Last night, for example, I turned my monitor off (power button), and when I woke up and turned it on, the screensaver hadn't kicked in.
Power Plan is High Performance, monitor-off is "Never", sleep is "Never".
Without changing any settings, my screensaver kicks in sometimes and not others. Overnight it hasn't been turning on lately, but when I went out for dinner it was on when I came back. It's really starting to baffle me.
Update: The screensaver seems to not activate correctly more often when I have updates waiting to be installed (I hate rebooting).
1That's what I was thinking, but I'm not running anything media-related.. – Andrew Coleson – 2009-10-13T15:37:50.537
If this occurs again, try to find some connection to what you did before. – harrymc – 2009-10-13T16:17:37.460