Q: OSX Lion + 2011 iMac 27'' + Video = Freeze

Some people here have already mentioned it: the temporary solution is to turn going into sleep mode off. It doesn't seem like solid permanent solution, but at least you don't have to reboot your computer every time you watch video after sleeping mode

Count me in. Brand-new 21.5 + Lion + sleep + video = total freeze. Support/Genius has walked me through several of the fixes mentioned here but no luck, all the while cautiously avoiding any statement that might imply there is an issue on their end.

Same problem also brand new 21.5 it reminds me when i had a WIFI problem with first ipad i brought it to store and called many times no help.

I just bought a 21.5 with 16 gig of Ram and was afraid that I had a faulty computer.  It has froze at least once a day since I got it 5 days ago.  Glad it isnt just me.

I have exactly same problem with my new Imac 27 2011

Same issue here in the Netherlands.

iMac 27", 16gb RAM, 256GB SSD (LOOOOOVE IT!) + 2TB extra drive

Youtube, itunes freeze video now or then

Hope it's not the hardware and a update will fix it!

Yep, exactly the same problem here with a new 21.5". Hope this gets fixed soon!

same problem - usually when 21.5" imac wakes from sleep, go to watch youtube video, or usually any web video, and os lion freezes.  can only move mouse, can still hear sound.  have to do hard reboot

annoying

need this fixed.

I posted earlier in this thread with the same problem.  I have done a bit of sleep testing it seems to happen if there is a full screen app running when sleeping and therefore when waking.  It happens consistently if I

force sleep with a full screen app running but if only one desktop no full screen apps then no problems on wake.

Does anyone else find the same?

iMac 2011 21.5 inch 2.7GHz i5

If this is the case and not just chance then as a work around exit full screen apps and possibly close down other desktops before sleep.  A pain but this should resolve things until the inevitable update fix.

Come on Apple.  I just made the jump from PC don't let me land in less fragrant fields than I had hoped.

I have the same problem with the desktop freezing after sleep with a 2010 27" iMac after upgrading to Lion.

If you have "Remote Login" enabled in the Sharing Preference pane you can ssh from another computer and do

a proper shutdown or reboot from the command line.

Has anyone tried installing this update: http://support.apple.com/kb/DL1389

If so, does the problem still exist?

@Allan1 Which command are you using for reboot or shutdown?

@sycren Is there a way to figure out which graphic adapter FW I am currently using?

This has happened to me without full-screen apps.

I've been working with an Apple engineer for the past week, and he had me try everything suggested in this very long therad. He also asked me to do a clean install on a different disk, which I did yesterday. I was unable to reproduce the problem, despite running lots of videos, sleeping often, etc. This doesn't mean it won't happen, but I was able to easily reproduce it on my main boot partition.

There are certainly many variables - the clean install had no third-party sofware installed. But given the number of people posting here, I doubt that there's any third-party software responsible. (Also, the Apple engineer has seen my crash logs, and hasn't suggested that any specific software could be responsible.) So I'm a bit flummoxed by this latest development...

I'm posting information and comments on my blog:

http://www.mcelhearn.com/2011/07/31/new-imac-lion-video-freeze/

Yes, I installed it, and, no, it didn't resolve the problem. In fact, I installed it before Lion, and things worked fine under Snow.