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Display Sleep not working


刘明雄
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'm using mavericks


On both 'System Preferences' > 'Energy Saver' > 'Display Sleep' does no longer work reliably (compared with Mountain Lion).


When I close all apps and set the Display Sleep time to "1 min." (minimum) and wait...  in the majority of cases the display stays ON!


What's the reason? How can this be fixed?


Many thanks!


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When it goes to display sleep but the display itself stays on, is the mouse cursor disappears, and the screen freezes (test with playing a video)?

The mouse cursor is still on desktop,the screen is working well.

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