Possible Mountain Lion defects for Multiple Monitors

Discussion in 'Mac Pro' started by deconstruct60, Aug 2, 2012.

  1. deconstruct60 macrumors 604

    Mar 10, 2009
    It appears there may be a problem with multiple active GPUs and Mountain Lion.


    The defects appears to go away if stop using monitors so that only one GPU is in video output service at a time.

    Sure looks like Apple QA set-up is either lax or unimaginative. Lax if didn't catch this in testing. But more likely unimaginative, skips testing completely the BTO configuration that has two graphics card.

    FCPX choking on the app spread over multiple GPUs seems indicative that it is the latter above.
  2. unclegit macrumors member

    Jan 10, 2008
    There is also a problem if you try to use external monitors in a rotated configuration.
  3. pprior macrumors 65816

    Aug 1, 2007
    I know you have mentioned this here, but I'm using two monitors, one being rotated 90 degrees with no issues at all (GTX680)
  4. unclegit macrumors member

    Jan 10, 2008
    Ironically the my 570GTX is running just fine - the problem is occurring with the original 8800 card...

    I think it may have to do with having multiple cards in the system rather than multiple monitors and a single card.

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