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Level 1

0 points

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

Best reply

rkaufmann87

Level 10

140,682 points

Posted on Jul 21, 2011 6:49 AM

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.

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94 replies

Jul 23, 2011 5:05 AM in response to Kahlzopf

I already tried this numerous times and it doesn't work. I have tried a resetting SMC the old and the new way!

c0rre

Level 1

0 points

Jul 23, 2011 6:20 AM in response to Kahlzopf

Might be a layman's lame idea, but I thought I'd post it:from what I gathered, this problem already appeared under Snow Leopard (albeit not this common). The problem appears to be buggy support for the new Thunderbolt technology. On June 27th, Apple issued a Thunderbolt firmware update. What if we tried to run that under Lion? Did they adapt anything that might have an influence on these issues?

Frankly, I'm too scared to try it out myself, firmware fondling can become quite messy. But what about the theory?

Kahlzopf Author

Level 1

0 points

Jul 23, 2011 6:29 AM in response to Drownd100

I reinstalled Snow Leopard and EVERYTHING is fine.

Jul 23, 2011 6:58 AM in response to c0rre

I tried to install that update from June 27th just to see what would happen, and it said I don't need it.

Jul 23, 2011 2:07 PM in response to Kahlzopf

I also lost minidisplayport functionality with the upgrade to lion. How did those of you downgrade back to snow leopard?

swissmac

Level 1

25 points

Jul 24, 2011 12:04 AM in response to Kahlzopf

Same problem:

MacBookPro 13 " with SnowLeopard --> HDMI-Audio on my BENQ E2220HD worked
upgraded to Lion -- > NO HDMI-Audio found

dnye2

Level 1

0 points

Jul 24, 2011 8:40 AM in response to Kahlzopf

Thank u apple for screwing it up!

Jul 24, 2011 9:13 AM in response to Kahlzopf

Apple has just seeded 10.7.2 to developers and I was wondering if anyone here is able to apdate and see if it fixes our problem??

Jul 24, 2011 9:34 AM in response to Kahlzopf

Tha same happens on Macbook Pro 13 8,1.

My TV isnt listed on output settings.

Setek

Level 1

10 points

Jul 24, 2011 8:01 PM in response to Setek

Well the Apple Genius bar know nothing about this issue, seemed to believe it was my "third party apps" that were at fault for it. I logged a ticket stating it's also happening with DVDs and Apple's DVD Player software (concluding it's not my third party apps) however they're hopeful bugs will be submitted over the week and bugfixes soon.

As I didn't set this machine up with Time Machine, I cannot be bothered downgrading, and will wait it out. Will update when some update fixes this issue for OS X Lion.

Jul 25, 2011 12:43 PM in response to Kahlzopf

All,

I have the same issue with a new iMac (May 2011).

HDMI Audio has disappeared during the Lion Upgrade.

Major pain as I just put in a 60ft high peformance HDMI cable with a repeater from my office to the TV in the other room.

Everything worked perfectly under Snow Leopard, but does not work under Lion.

This will require a fix in 10.7.1. I don't believe there is an SMC or PRAM reset solution.

Regards,

Paul.

Kahlzopf Author

Level 1

0 points

Jul 25, 2011 1:13 PM in response to paulnsenior

Nothing will help you fix it. Either you wait for apple to fix it or you are smart and return to snow leopard until it is patched by apple.

I don´t think, that anyone of you won´t be able to work without lion, hm?

Unfortunately apple did not tell us, that the output does not work properly yet. Thats sad and pure capitalism. No one can tell me, that they did not know this issue...

chrisd.

Level 1

0 points

Jul 25, 2011 1:14 PM in response to madsenfelipe

Same over here... MacBookPro 8,1 with BenQ Monitor/ Sony TV... picture is there, sound missing; also not available in output devices. Tried everything with assistance of apple support... nothing.... downgraded to snow leopard everything is fine!

Jul 28, 2011 6:10 AM in response to paulnsenior

I have the same problem since updating to Lion; the sound output via HDMI option is gone. I use an iMac (bought Dec. 2010) to Panasonic Plasma and only watch TV via BBC's iPlayer etc. and a very long HDMI cable so now I cannot as the sound from the iMac is too far away. Also, the resolution options seem to be worse after Lion as now the Mac OS bar at top is off the screen no matter what resoliution I select and there is a ghosted 'Panasonic' option under the monitors I can no longer select. Any word from Apple what they are going to do about it? If sound via HDMI has been dropped never to be re-introudced then I'd rather revert to Snow Lep. or heaven forbid consider a PC if Apple are going to go two steps ahead one back.

bjouan

Level 1

0 points

Jul 29, 2011 10:35 PM in response to Kahlzopf

I have got the same problem here with my Mac Pro 8,1. With Snow Leopard was great... after Lion no sound through HDMI.

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