Is this a bad GPU or Lion bug?

Discussion in 'iMac' started by jrichman63, Sep 27, 2011.

  1. jrichman63 macrumors regular

    Joined:
    Sep 4, 2006
    Location:
    Pacifica, CA
    #1
    This is a screenshot of my background of my new 27 i7 SSD iMac. Is this a bad GPU or Lion bug? The artifact disappeared after a restart.
     

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  2. Comeagain? macrumors 68020

    Comeagain?

    Joined:
    Feb 17, 2011
    Location:
    Spokane, WA
    #2
    If you were able to take a screenshot of it, that would mean a lion issue. Otherwise, all of us wouldn't be able to see it, only you on your computer.
     
  3. AbeFroman77 macrumors 6502

    Joined:
    May 29, 2010
    #3
    Lion bug. Happened on both 2011 27" iMacs I had (3.4ghz, 4gb, 256ssd+1tb, 6970m 2gb). It happened whenever I watched a hd video on youtube, quicktime or itunes.
     
  4. jackoatmon macrumors 6502a

    jackoatmon

    Joined:
    Sep 15, 2011
    #4
    I get the same artifact on my rig from time to time.

    I suspect it's driver-related.
     
  5. warxy macrumors newbie

    warxy

    Joined:
    Sep 11, 2011
    Location:
    Perth
    #5
    I used to get artifacts like that when my PC's GPU and vram heats up too much from over clocking. I suspect it could be an overheating issue or driver related problems like jackoatmon said.
     
  6. jackoatmon macrumors 6502a

    jackoatmon

    Joined:
    Sep 15, 2011
    #6
    Pretty sure it's not heating issues. I did a good amount of testing and managed to get artifacts under low workloads/low heats.

    The reason I speculate that it's driver related is that it seems to be most easily activate by putting flash video into fullscreen mode (not the Lion native fullscreen, but a non-native one version - say a video player on a website or whatever). This points to a firmwear issue rather than a hardware issue.

    Hence, I wouldn't worry about it. It will likely get fixed in some future combination of OSX/Radeon drivers.
     
  7. hifoo45 macrumors member

    Joined:
    Apr 29, 2010
    #7
  8. jrichman63 thread starter macrumors regular

    Joined:
    Sep 4, 2006
    Location:
    Pacifica, CA
    #8
    OK this is good news. At least for me, because I would hate to have go though the hassle of the exchange process for my new iMac. The screen is perfect on this one.
     
  9. basher macrumors 6502

    basher

    Joined:
    May 27, 2011
    Location:
    Glendale, AZ USA
    #9
    I get similar artifacting. Like others stated, mostly when watching HD videos. I found that logging out and then back in corrects the issues. IMO it's a driver issue.
     
  10. jrichman63 thread starter macrumors regular

    Joined:
    Sep 4, 2006
    Location:
    Pacifica, CA
  11. kgapp macrumors member

    Joined:
    Jan 6, 2004
    Location:
    Chicago, IL
    #11
    Definetely a LION related issue. I get the first one you posted on my iMac 27 i7 and the second you posted on my 2009 Mac Pro. Hopefully they will sort this out for a update soon.
     

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