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User profile for user: davidnave
davidnave Author
User level: Level 1
10 points

When waking Macbook Air 2012 from the Login Screen, the display flashes, then works normally. Mildly concerned.

I have only noticed this behavior when no users are logged in, and the computer is put to sleep by closing the clamshell. It also only appears to happen after an extended sleep, meaning 30 minutes or more. I open the clamshell, the backlight comes on, I see the login screen, then the screen flashes like when Photo Booth takes a picture, then the computer works normally. This is not a great concern, but it is unusual. It doesn't happen when a user is logged in. It doesn't happen during boot. I am running 10.8.2, and do have power nap enabled. I have noticed the behavior both when running on the power adapter and on the battery. No Accessibility functions enabled. Trying to isolate the issue, and reaching out for others with same behavior. Cheers.

MacBook Air, OS X Mountain Lion (10.8.2)

Posted on Sep 20, 2012 7:45 AM

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User profile for user: Jon P D
Jon P D
User level: Level 4
1,522 points

Posted on Sep 20, 2012 11:25 AM

the screen flashes like when Photo Booth takes a picture

Do you have any security software installed? Some have features that take a photo with the webcam when the lid is opened.

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User profile for user: davidnave
davidnave Author
User level: Level 1
10 points

Sep 25, 2012 11:38 AM in response to davidnave

Sorry, I haven't been checking in. I do not have any security software installed. I do not typically leave the computer logged into because the computer is shared, so I can't vouch that it only happens at login screen. It definitely only happens when opening the computer from clamshell, and only after it's been asleep 10 mins or more. Noticed too that tap to click starts to work at the login screen after it flashes. No software running in the background, nothing in /library/launchagents or /library/launchdaemons or /library/startupitems. I have an image of 10.7.5 on an external drive, and the issue does not occur when booted to that. It is only in 10.8.1 and was not resolved by the 10.8.2 update.

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When waking Macbook Air 2012 from the Login Screen, the display flashes, then works normally. Mildly concerned.

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