rMBP/2012MBA ext Audio degrading

Discussion in 'MacBook Pro' started by dark knight, Jul 17, 2012.

  1. dark knight macrumors regular

    Oct 28, 2008
    In a nutshell, with both my new rMBP and a few other forum member's 2012 MBA this problem occurs, more usually with an Apple Thunderbolt Display. I ask here as it is discussed in the Air forum. Also, no one else seems to mention it being a problem with USB audio too.

    Audio is fine using the headphone jack/internal speakers. Audio is also fine using an external sound source such as aThunderbolt Display or a Digidesign Mbox2 (USB). However, when you start doing something graphics intensive the audio on the external device begins to degrade into static until it goes entirely. This can takes a few minutes to appear and then a few more minutes to die completely. It happens on both Thunderbolt and USB buses. Even after the audio has degraded, the internal speakers/headphone jack are totally unaffected. The problem with the external device seems to need a reboot to fix. The problem does not seem to be different if using discrete or integrated GPU.

    Anandtech discusses a problem with the Thunderbolt Display and a Pegasus drive but as far as i can tell he does not speak of the problem being broader than that scenario.

    Has anyone had any feedback from Apple about this. It seems to predate the rMBP so you would have thought they might have fixed it by know, or at least acknowledge it.
  2. Kaemon macrumors member

    Jun 22, 2009
    Actually when I plugged my rMBP into HDMI, when I had sound go through HDMI it started to lag, got choppy, and was horrible as well. Gets worse as it goes on as well.
  3. Dwhite78 macrumors regular

    Jul 30, 2010
    I agree there is a problem, but I'm not certain where it lies. I can use an external USB DAC and solve this problem. That defeats the purpose though of having a single connection for everything.
  4. dark knight thread starter macrumors regular

    Oct 28, 2008
    so, by using that DAC, i think you are doing the same as me, just a USB audio interface. Which would suggest that the problem is not common to all USB or TB sound devices, just some?
  5. dark knight thread starter macrumors regular

    Oct 28, 2008
    i got my hopes up that the Lion Macbook Pro update released today, that specifically mentions stability of USB devices, would fix the issue. unfortunately, no. If Mountain Lion also fails to fix this i'll contact Apple.
  6. dark knight thread starter macrumors regular

    Oct 28, 2008

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