Since upgrading to Windows 7, on occasion I’ll find the screensaver timeout isn’t working. The best security of course is to lock the computer when you walk away from it rather than relying on the timeout. But when you’re home alone, it is convenient.
Searching the internet found a couple of interesting possibilities. A wireless mouse issue causing “activity” to occur preventing the screensaver from coming on. I don’t have a wireless mouse. Fortunately the next link found was more helpful. Some MagicJack users were finding the software was preventing their computer from dropping into hibernate and the screensaver wasn’t working either. While I don’t have MagicJack either their troubleshooting steps helped.
By running powercfg /requests within an elevated command prompt, I enumerate application and driver power requests. Power requests prevent the computer from automatically powering off the display or entering a low power sleep mode. Help doesn’t mention how that effects the screensaver.
Closing my browser results in the Flash entry leaving. The screensaver then kicked in at the normal 10 minute interval. I can’t reproduce the behavior at will however. Not every usage of Flash causes this behavior. That makes me wonder if the author of the Flash video is setting something.
I’m not sure what can be done. This issue is that you can no longer rely on your enterprise computers to lock correctly under Windows 7. Windows Media Player had a group policy setting to allow the screensaver to lock even when Media Player was running. I don’t know of anything similar for Flash. If you have thoughts, it the comments below.