Kahlzopf

Q: Lion Upgrade: No audio via miniDisplayport to HDMI (iMac)

Using the mid 2011 iMac and a (Denon1912) A/V-Receiver. iMac connected via miniDisplayport-to-HDMI-adapter to the receiver.

 

With Snow Leopard it worked. Video and Audio were always detected by the receiver and sent to the monitors/speakers.

 

With Lion the video-output of the iMac only gets activated when i put the computer to sleep and wake it up. The audio-output via miniDisplayport/HDMI does not work. The audio-options do not list my receiver - only the internal speakers.

 

Cables are connected on startup, A/V-Receiver is turned on and set to the correct channels before booting the iMac.

 

How can I fix this? Downgrade and wait for bugfixes?

iMac, Mac OS X (10.7)

Posted on Jul 21, 2011 2:40 AM

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Q: Lion Upgrade: No audio via miniDisplayport to HDMI (iMac)

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  • by rkaufmann87,Solvedanswer

    rkaufmann87 rkaufmann87 Jul 21, 2011 6:49 AM in response to Kahlzopf
    Level 9 (58,785 points)
    Photos for Mac
    Jul 21, 2011 6:49 AM in response to Kahlzopf

    If you left all the peripherals connected while performing the Lion upgrade that may have confused the SMC. Do a SMC reset (it may take 2-3 attempts) and see if that helps. Please follow the instructions carefully.

     

    SMC RESET

     

    • Shut down the computer.
    • Unplug the computer's power cord and all peripherals.
    • Press and hold the power button for 5 seconds.
    • Release the power button.
    • Attach the computers power cable.
    • Press the power button to turn on the computer.

     

    PRAM RESET

     

    • Shut down the computer.
    • Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    • Turn on the computer.
    • Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
    • Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    • Release the keys.
  • by luimarsa,

    luimarsa luimarsa Jul 21, 2011 10:18 AM in response to rkaufmann87
    Level 1 (0 points)
    Jul 21, 2011 10:18 AM in response to rkaufmann87

    Thanks.

     

    It worked perfect for me.

     

    Now, I have sound in my TV trough HDMI again.

  • by rkaufmann87,

    rkaufmann87 rkaufmann87 Jul 21, 2011 10:21 AM in response to luimarsa
    Level 9 (58,785 points)
    Photos for Mac
    Jul 21, 2011 10:21 AM in response to luimarsa

    Your welcome, never heard back from the OP though. 

  • by Kahlzopf,

    Kahlzopf Kahlzopf Jul 21, 2011 10:57 AM in response to rkaufmann87
    Level 1 (0 points)
    Jul 21, 2011 10:57 AM in response to rkaufmann87

    That worked! Thank you very much!

    First the video transmission worked properly and after one additional reboot the audio got through.

  • by rkaufmann87,

    rkaufmann87 rkaufmann87 Jul 21, 2011 10:59 AM in response to Kahlzopf
    Level 9 (58,785 points)
    Photos for Mac
    Jul 21, 2011 10:59 AM in response to Kahlzopf

    Your welcome!

  • by JB in WI,

    JB in WI JB in WI Jul 21, 2011 11:26 AM in response to rkaufmann87
    Level 1 (25 points)
    Jul 21, 2011 11:26 AM in response to rkaufmann87

    You have those reset steps copypastad in a sticky, don't you.

  • by rkaufmann87,

    rkaufmann87 rkaufmann87 Jul 21, 2011 11:30 AM in response to JB in WI
    Level 9 (58,785 points)
    Photos for Mac
    Jul 21, 2011 11:30 AM in response to JB in WI

    Pretty much, I wrote them in a Pages document and simply copy and paste them when needed. I use Spotlght to locate and launch the document. Because it's a common fix I did it that way. If I really wanted to get geeky I could use Automator to automate the whole process for me but I'm too lazy for that. 

  • by JB in WI,

    JB in WI JB in WI Jul 21, 2011 11:32 AM in response to rkaufmann87
    Level 1 (25 points)
    Jul 21, 2011 11:32 AM in response to rkaufmann87

    Ooo, you could even bind it to a hotkey

  • by rkaufmann87,

    rkaufmann87 rkaufmann87 Jul 21, 2011 11:34 AM in response to JB in WI
    Level 9 (58,785 points)
    Photos for Mac
    Jul 21, 2011 11:34 AM in response to JB in WI

    Yup.

  • by Kahlzopf,

    Kahlzopf Kahlzopf Jul 22, 2011 1:22 AM in response to rkaufmann87
    Level 1 (0 points)
    Jul 22, 2011 1:22 AM in response to rkaufmann87

    Too fast, it still does not work. I will change back to Snow Leopard this evening.

     

    Another question: Are Dolby Digital/AC.3 or DTS transported via HDMI? If the connection works, I only get a stereo-signal.

  • by Setek,

    Setek Setek Jul 22, 2011 5:59 AM in response to rkaufmann87
    Level 1 (10 points)
    Jul 22, 2011 5:59 AM in response to rkaufmann87

    This didn't work for me, with a June 2011 MBP :/

     

    I don't suppose there are any other magic tricks that'll work without having to go through the pains of downgrading back to Snow Leopard? Pretty please?

  • by Sean-B-89,

    Sean-B-89 Sean-B-89 Jul 22, 2011 5:58 AM in response to Kahlzopf
    Level 1 (0 points)
    Jul 22, 2011 5:58 AM in response to Kahlzopf

    On my MacBook Pro Early 2011 the sound is also not working anymore since Lion.

     

    I have got a Displayport to HDMI converter and it is hooked up to my TV.

    In Snow Leopard I always had sound on my TV with this cable, but since I have updated to Lion it isn't working anymore.

     

    If I'm looking at the System Prefs -> Audio I don't see HDMI in that list no more.

     

    I have reset the SMC and PRAM a couple of times, but it didn't brought me any solution! What now?

     

    @ Topic Starter,

    Dolby Digital 5.1 has worked for me through the HDMI in Snow Leopard, I haven't tested DTS, because my TV doesn't support it!

  • by Kahlzopf,

    Kahlzopf Kahlzopf Jul 22, 2011 6:06 AM in response to Sean-B-89
    Level 1 (0 points)
    Jul 22, 2011 6:06 AM in response to Sean-B-89

    ok, when DD5.1 comes through, DTS will as well. ty.

  • by Drownd100,

    Drownd100 Drownd100 Jul 23, 2011 1:37 AM in response to Kahlzopf
    Level 1 (0 points)
    Jul 23, 2011 1:37 AM in response to Kahlzopf

    I've tried to reset the SMC and PRAM around 5 times and still no working sound output from the mini Displayport. It worked fine in Snow Leopard and now I'm thinking of restoring back if there is no solution! I have the latest 2011 Macbook Pro.

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