Skip navigation

Low graphics performance after wake. Mid 2011 iMac, 6970M

423 Views 8 Replies Latest reply: Mar 23, 2013 9:59 AM by rspRoland RSS
rspRoland Level 1 Level 1 (0 points)
Currently Being Moderated
Feb 21, 2013 4:32 PM

Hello guys,



I'm having this issue since forever, I think I read all the possible threads there are about this and still haven't managed to find a fix. Didn't really care about it until now because I didn't really notice it since I don't really game anymore, but now I really need to use Parallels daily and I'm forced to reboot several times a day because of this.


I'm also making my own thread because in all the threads I read no one with this problem had my graphics card, so ... maybe I'll get lucky


So, the problem goes like this: the Mac behaves properly until I put it in sleep. After wake graphic performance becomes really low: Games run like crap, I can't run Parallels because I can grow a beard till the graphics load, even Misson Control animations are choppy. I tried:

  • the changing resolutions method: change resolution to anything else, then back to "best for built-in display" to 'reset' the graphics, but as far as I understand this, it doesn't even work because the resolution is scaled.
  • creating a custom switchResX resolution, non-scaled. Did not work, screen went blank although it was a 1280x1024 one, which the display supports.
  • resseting SMC and PRAM
  • deleting power management, autoWake and systemui plists
  • disconnecting everything except the keyboard
  • turning the AirPort off before sleep
  • everything above on 1) a different, barely created account, 2) a different, existing account, 3) the root account
  • logging out and back in
  • I even tried the Multibeast solution for hackintoshes that patches a smbios plist. (yea, I'm that desperate and don't even know what it does, so I tried it anyway)
  • Tested with Cinebench before and after sleep and indeed, before sleep I get ~28fps, after sleep I get ~15-17fps.
  • I don't have any temperature problems, everything is cool and the fans are running at min.


The only real "fix" for this is a reboot.


Running the Mid 2011 iMac, 3.4GHz i7 with the 2GB 6970M, 16GB of RAM.



Anyone has any other ideas, or had luck with anything else?

iMac, OS X Mountain Lion (10.8.2)
  • ssls6 Level 4 Level 4 (2,410 points)

    I've read of Mac Pro users having this problem on non-standard video cards, but never an iMac.  I guess if it were my mac, I would try this.


    Disconnect all but keyboard/mouse


    1) Reboot and at the chime, hold D....This should invoke apple hardware test.  If this doesn't work, reboot and hold Option-D  This is the internet version of Apple hardware test.  Run the test just to make sure you don't have a hardware problem.....if good


    2) Reboot into recovery (Command-R), check the HDD for errors (repair hard drive).  If it comes back good, then I would reinstall the OS over the top of the existing OS.  You won't lose anything and if something is mucked up, it could fix it.


    An alternative to (2) is to redownload Mountain Lion from the MAS and then run it, select your "Macintosh HD" for the install target.


    The reason I would do these two things is to have confidence that my hardware/software is good.

  • ssls6 Level 4 Level 4 (2,410 points)

    I forgot to add, please make sure you have a good TM backup and a clone to be really safe.  You said you've had this problem forever, do run the AHT.


More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.