rMBP: Dual Display = no stuttering

Discussion in 'MacBook Pro' started by gentlefury, Jul 30, 2012.

  1. gentlefury macrumors 68030

    Joined:
    Jul 21, 2011
    Location:
    Los Angeles, CA
    #1
    OK, this is weird. I finally got my rMBP and....as everyone has been complaining about Mission Control is stuttery when its activated and kind of annoying. Well, it doesn't really bother me, so I don't care, since everything else is so good.

    I rearranged my desk and got my second display plugged in and guess what. All of a sudden...no stutter at all...everything is perfectly smooth! I did notice that discrete graphics are required in order to push multiple displays. Is this the reason? I tried switching to discrete without the other display plugged in and it was still stuttery. It only seems to clear up and run smooth when I have to power a second display!! How weird! Good to know it is just a software hiccup and not at all to do with the hardware! I'm sure it will be cleared up soon.
     
  2. Queen6 macrumors 603

    Queen6

    Joined:
    Dec 11, 2008
    Location:
    Enjoying Better Things
    #2
    When you use an external monitor, only the discrete GPU is used which is more than powerful enough.
     
  3. Dangerous Theory macrumors 68000

    Joined:
    Jul 28, 2011
    Location:
    UK
    #3
    He also explained that he forced the DGPU with the one display and it "lagged". Goes to show software is having some problems somewhere in the pipeline.
     
  4. gentlefury thread starter macrumors 68030

    Joined:
    Jul 21, 2011
    Location:
    Los Angeles, CA
    #4
    Right, it's only perfect when running 2 displays.
     
  5. ProMod macrumors 6502a

    Joined:
    Dec 29, 2005
    #5
    I have noticed this exact behavior for many years on all of my MBPs. They are always smoother in a dual display setup rather than just powering either the built-in display or external display individually. It must have something to do with how the OS is written to "throttle up" the GPU when it is powering two displays.
     

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