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When my 2011 iMac's display shuts off - before the computer goes to sleep, but after a screensaver might display - there is frequently a 5-15second delay with the display coming back.

What I see is the backlight on the display come on, showing a completely black screen with the only exceptions being my cursor and any notifications in the upper-right that have appeared since the display shut off.

I can move the cursor around without trouble. I cannot interact with the notifications.

After a delay the rest of the display returns: the dock, open windows, etc... exactly as I left it.

I have only experienced this issue for the last 2-3 months. Is there a way to stop this delay? What causes this?

Update

I see the following in the activity console.

10/8/14 1:04:59.000 AM kernel[0]: PM notification cancel (pid 129, screens_connectd)

10/8/14 1:05:09.872 AM WindowServer[152]: CGXDisplayDidWakeNotification [193459014260005]: posting kCGSDisplayDidWake

10/8/14 1:05:09.873 AM WindowServer[152]: handle_will_sleep_auth_and_shield_windows: Deferring.
  • you need the Console log from the time stamp to analyze what is preventing the display. – Ruskes Oct 8 '14 at 1:25
  • @Buscar I updated my question with a couple log messages. – Deefour Oct 8 '14 at 5:09

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