Display Sleep problem fixed,non Apple kernel extensions removed

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Display Sleep problem fixed,non Apple kernel extensions removed

I run a Late 2009 Mac Pro 8-core 24/7 at about 95-97% cpu use. (2 x E5520 Xeon cpus). After installing OS X 10.7 Lion this morning the Display Sleep function stopped working. Lots of searcing and reading led me to a solution. Credit goes to Bill Ellis for his trouble shooting post http://osxdaily.com/2010/08/03/list-all-third-party-kernel-extensions/

Non Apple kernel extentions were the problem, specifically VirtualBox. Removing VirtualBox solved the problem and my Display now goes to sleep, whew.

Open a Terminal (Finder -> Applicaitons -> Utilities -> Terminal).

Type "kextstat | grep -v com.apple" and see what is there. I then located the VirtualBox folder and clicked on the unistall utility. This removed the kernel extentions (5) and my Display went dark in one minute as I had it set in Preferences -> Energy Saver.

Thanks too the Apple Technical people who listened to my problem on the day that Lion was released. I'm grateful and impressed. Hope that this can help someone else find and solve a problem.

Mac Pro (2009) 8-core, iMac, Mac OS X (10.7), iMac C2D, iPhone 4

Posted on Jul 20, 2011 5:13 PM

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Answer 1

Jul 21, 2011 9:10 PM in response to SoFong

I too am having this problem. However, when I grep kextstat it returns zero results, so I suppose I don't have kernel extensions causing the problem. Wonder what others are experiencing. 24" iMac, 3.06GHz Core 2 Duo, Lion.

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Answer 2

Jul 22, 2011 11:05 PM in response to mpieracci

After fiddling with sliders in Energy Saver, seems to have fixed itself.

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Answer 3

Jul 22, 2011 11:12 PM in response to mpieracci

This seems to be a common problem on MacBook Pros, also with the computer not going to sleep when the lid is closed. Some people thought it was related to having an external monitor hooked up, but others and I have had this problem regardless of whether or not the external monitor is hooked up.

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Answer 4

Jul 27, 2011 4:36 AM in response to gbfluteman

The problem I am having with Lion and my MacBook Pro (2007) is that it will not wake from sleep - and this seems to be intermittent. This morning for example it woke Ok after leaving it all night - then just now it would not wake after merely one hour 'asleep' . I have reset SMC and tried all sorts of tips I have seen on these posts - such as do not check Internet sharing. Another was to try and push the on button lightly - then try to wake it again. Nothing works!

It is strange that I installed Lion the same day on my Imac and have no problems re waking from sleep with that.

I am using my MBP with the lid closed an with an external display

It seems that others are having a range of 'sleep disorders' with Lion!

Can Apple please fix this????????? Does anyone have any other work arounds for now? I am getting really fed up with having to do a hard restart.

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