Previous 1 2 3 4 5 Next 72 Replies Latest reply: May 17, 2013 6:20 PM by gary oldknow Go to original post
  • mcescher78 Level 1 (0 points)

    Looks like I spoke too soon. It went away after disabling the feature...but now it's back.

  • Judith Evans1 Level 1 (30 points)

    Getting the same problem.  Have reset the PRAM too, as thought that might work, but had no effect.  Have just tried turning off mirroring to see if that works.

  • Jose Canciani Level 1 (0 points)

    Had same issue here, after enabling power nap con battery mode, screen flashes 2 times when opening the lid.

    Disabled it and now works ok. A very annoying bug.

  • slamj Level 1 (0 points)

    I have tried everything, and am still have the issue with the screen flashing brightly twice after waking the Air from sleep. It seems to be a hardware issue with Mountain Lion. Anyone fix this issue?  I have tried all suggestions within this post.

  • bloodnok Level 1 (0 points)

    not just macbook air afflicted with this. my 13" retina macbook pro has it, too. it's some sort of bug introduced in 10.8.2.

     

    along with that, mountain lion takes far too long to enable the login prompt from sleep - upwards of 30sec in some cases. too many times, i've ended up with just the end of my password entered and the shivered you got it wrong response from the o/s. this happens on my imac, my macbook pro, and happened on my retired macbook air. the corollary to that is when putting the imac to sleep, it can take over 30sec for it to be effective. this is new in 10.8.2. 10.8.0 was slow to wake. the latest updates have made its behaviour worse.

     

    well tested, apple!

  • davidnave Level 1 (10 points)

    Some new information. I noticed that when opening the clamshell after a long sleep, the login screen is there, but the cursor will not move for several seconds. I have noticed with a lot of the Mountain Lion Macs I work with. But on the Air, the screen flashes before the the cursor will start tracking. Also, a couple times, I get the bluetooth mouse setup assistant window right before the screen flashes. The Air has a built in trackpad, which should always be detected. Think this is related.

  • NickH2 Level 1 (5 points)

    I had the same problem with my mid 2009 MacBook Air after the latest Moutain Lion 10.8.2 upgrade but it seems to have been solved for me by:

     

    (a) Enabling the Power Nap (it was off) in Enery Saver -> Battery

    (b) Unchecking the "Show mirroring options in the menu bar" in Display

         ("Automatically adjust brigthness" is turned on on my MBA)

    (c) Locking the Enegy Saver preferences

     

    I have tested various combinations of sleep/restart/log-out with lid closed and then opening it and I don't get the flicker any more.

     

    It could be a long-term rather than short-term problem as others have commented so will continue to monitor (sorry - bad pun!)

  • davidnave Level 1 (10 points)

    Looks like a good combo to try. I will try it as well. Keep us updated.

  • mushu637 Level 1 (0 points)

    (a) Enabling the Power Nap (it was off) in Enery Saver -> Battery

    (b) Unchecking the "Show mirroring options in the menu bar" in Display

         ("Automatically adjust brigthness" is turned on on my MBA)

    (c) Locking the Enegy Saver preferences

    didn't help... The problem is still there (((( MCA 13" mid 2011

    Apparently it's flashes only on battery power... if you plug in power before opening the lid, it's logs in normally...

    the other thing I notice, it flashes if network changes... i worked in the morning at home, closed the lid, open at work and it flashes... and same thing in the evening... Apple support didn't help, and had no idea what it could be... to me it is obvious bug in Mountain lion... hope Cupertino gyus are monitoring this...

  • drvinginshlagin Level 1 (0 points)

    That's exactly what I have. Thought it was something to do with me trying to partition my drive to run Ubuntu & OS X, so deleted the Ubuntu partition - but still it flashes. Very odd.

  • davidnave Level 1 (10 points)

    Does anyone have Dropbox, GoogleDrive running? Also, does anyone have iCloud's Back to My Mac enabled? I am frequently seeing a loginwindow error 1102 in Console, relating to Get Screen Sharing Port.

  • klockw243 Level 1 (0 points)

    Same flash issue when waking up 13" MBA (2012) after sleep on battery. Showed up after 10.8.2 update. Very annoying. Before I noticed the flash, it would lock out the mouse/keyboard input for a few seconds so I couldn't type in my password. Now, the last few days, it does that, then flashes white before becoming usable. This is a brand new machine with a fresh, clean install of Mountain Lion. Very frustrating, but I'm glad to see it's probably not hardware based, due to the other comments in this thread.

  • davidnave Level 1 (10 points)

    Update. I removed a file at the root level of the harddrive that was larger than it was supposed to be. It was located at /private/var/vm/ and called "sleepimage". It should be exactly the same size as the system memory (RAM), but mine was almost twice as large. I deleted the file, then restarted. The system will recreate that file the next time you put the computer to sleep. I have not had the flashing issue since. Crossing fingers.

  • klockw243 Level 1 (0 points)

    My flashing went away, but I've still got a delayed log-in screen; it shows up but doesn't let me enter anything for a good five seconds, plus the screen is dimmed.