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Mountain goes to sleep while running applications.

711 Views 11 Replies Latest reply: Feb 11, 2013 5:18 PM by EasyKoni RSS
Raffers63 Calculating status...
Currently Being Moderated
Jul 28, 2012 1:11 AM

I just upgraded my late 2009 iMac 27 to ML and now I notice that even while it's doing stuff e.g. encoding video, it goes to sleep and then resumes my encoding after I wake it. The whole point of starting an encoding task is to leave the computer unnattended and return when it's convenient to a completed task. This is not happening under Moiuntain Lion. Other than changing Energy Saver settings in System Preferences to NOT put the computer to sleep, I have no idea how to resolve this. Any ideas anyone?

iMac, OS X Mountain Lion, Late 2009 27
  • softwater Level 5 Level 5 (5,370 points)
    Currently Being Moderated
    Jul 28, 2012 1:15 AM (in response to Raffers63)

    In System Preferences > Security & Privacy click the Advanced button (bottom right, you will need to unlock the padlock bottom left first with an Admin password).


    Is the 'Log out after 60 minutes inactivity' preferences set? If so, unset it.

  • Pedro Perez Level 2 Level 2 (165 points)
    Currently Being Moderated
    Jul 31, 2012 8:32 AM (in response to Raffers63)

    THANK YOU! This is happening to me too! I am not crazy!!!~

  • Pedro Perez Level 2 Level 2 (165 points)
    Currently Being Moderated
    Jul 31, 2012 8:34 AM (in response to Raffers63)

    I also had to change the settings to NEVER put iMac to sleep. I am going to try to encode a file on my new MBP and see if it displays the same behavior, even though I totally agree with you--it's not a hardware issue.

  • Pedro Perez Level 2 Level 2 (165 points)
    Currently Being Moderated
    Jul 31, 2012 11:04 AM (in response to Raffers63)

    Dear Sir,

    Thank you for your reply. I am glad I am not mad! Wow, it seems like they just released this ML without caring. Let me ask you something just out of the blue. Do you use the headphone output as an input, too? Assuming you have the 13" with the combo headphone/mic? Another fail from Apple for removing the dedicated input.

    2nd do I go back to Lion? Will we be able to update again after they fix everything?

    Thank you again! Good day! or night!

  • mrbofus Level 1 Level 1 (5 points)

    I'm confused on one point though.  If we have non-SSD Macs, such as iMacs, Mac Pros, Mac minis, some MacBook and MacBook Pros and even some MacBook Air models, why do those non-SSD Macs have to utilize the same behavior as SSD Macs?  Why not just have non-SSD Macs use power settings that have been working in Lion, Snow Leopard, and earlier?


    i.e., if Power Nap compatible SSD Mac is running Mountain Lion, use Power Nap power management and if there is no SSD, don't use Power Nap power management. 

  • petr69 Level 1 Level 1 (0 points)

    Same problem on iMac 2011 and Macbook Air 2010 Handbrake, JDownloader, WOW launcher, .... I'm coming back to Lion and hope in patch 10.8.2

  • EasyKoni Calculating status...
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    Feb 11, 2013 5:18 PM (in response to Raffers63)

    Even iTunes can't handle the new power saving "feature"!  My MacBook goes to sleep while downloading with iTunes!


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