13" rMBP HDMI sound problem

Discussion in 'MacBook Pro' started by timsaxman, Mar 31, 2014.

  1. timsaxman macrumors member

    Joined:
    Feb 13, 2013
    #1
    Hi

    I have a 13" rMBP (late 2013) and lately the sound output when using HDMI has given me problems. It might be since I updated to 10.9.2 but when I plug in the computer to my TV via HDMI I get the sound from the computers speakers. When holding alt and pressing the sound icon the TV doesn't even show. The only solution I've found is to keep the TV plugged in and restart the computer (which I seldom do otherwise...). And after the computer sleeps or I unplug the TV I have to do the same routine again.

    Anyone else experienced or heard of this? Is there some way to report this problem and get an answer if a fix is coming?
     
  2. SkimMilk168 macrumors regular

    Joined:
    Mar 19, 2014
    Location:
    Singapore
    #2
    have you verified that it's not a faulty hdmi cable problem?
     
  3. timsaxman thread starter macrumors member

    Joined:
    Feb 13, 2013
    #3
    I have not, but it seems weird that a restart would solve it if it was cable problem.
     
  4. SkimMilk168 macrumors regular

    Joined:
    Mar 19, 2014
    Location:
    Singapore
    #4
    I'm thinking the cable is not negotiating properly between your tv n rMBP.
     
  5. dmccloud macrumors 6502a

    dmccloud

    Joined:
    Sep 7, 2009
    Location:
    Anchorage, AK
    #5
    This is actually an issue with the HDMI specification itself and how HDCP and handshaking is handled between devices. A lot of cable boxes (primarily Motorola and Pace boxes, but Tivos as well) will occasionally drop the audio portion of the signal. Restarting the computer effectively resets the HDMI handshake between the computer and TV.

    I worked in Tech Support for a Cable provider/Telecom (not Comcast or TWC) for six years, and it was common to see this issue with audio multiple times a day.

    (EDIT: because it's an issue with the HDMI spec itself, any update would need to come from the HDMI Forum, which is the group that creates the specs. HDMI 2.0 was just announced last September, and it may address this issue)
     

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