Currently Being ModeratedJul 21, 2011 9:11 PM (in response to brendanmitchell)
I have the same problem. I upgraded to Lion last night and tried to use my headphone today but it no longer works. I also tried two different headphones which were both working fine previously, and got the same problem. Also, as you mentioned, System Preferences/Sound/Output does not show Headphones as an option, only Internal Speakers.
This appears to be a bug with Lion.
Could someone from Apple look into this?
Currently Being ModeratedJul 22, 2011 11:04 AM (in response to brendanmitchell)
I'm having the same problem after a Lion upgrade. No sound output from the audio port - it looks like the port is simply not recognizing when a plug is inserted.
2011 Macbook Pro 13" 2.3GHz i5, 10.7
Currently Being ModeratedJul 22, 2011 8:50 PM (in response to uram)
I have the opposite problem. After upgrading to Lion, only my headphones work. My MacBook Pro's internal speakers don't work; the internal speakers also don't show up in System Preferences/Sound/Output. It might be noteworthy that I had my headphones plugged in when I ran the Lion upgrade. Any Apple Engineers have a fix for this?
Currently Being ModeratedJul 23, 2011 1:10 AM (in response to brendanmitchell)
I have the same problem, I am really getting iritated with this new Lion software. Why cant they figure out these bug before selling the product. Very irritting Does anyone know how to fix?
Currently Being ModeratedJul 24, 2011 6:00 PM (in response to brendanmitchell)
I think I have found a solution to this problem. Go to Applications/Utilities/Audio MIDI Setup/Built-In Output/Output and in Format change from the default 2ch-24bit integer to any other format (say, 2ch-32bit float). This should activate the headphone jack. I moved the format back to the original 2ch-24 integer setting and the headphones continued working. So it seems that (for some reason) the original default setting does not recognize a headphone being inserted, but after performing this "resetting" it seems to come to its senses and behave properly from then on.
Hope this works for you guys.
Currently Being ModeratedJul 26, 2011 7:01 PM (in response to LT300000)
Nope, doesn't work. My problem is that NO AUDIO DEVICES ARE FOUND ON SYSTEM. I tried to change the midi output, but nothing is there, because my computer is not recognizing any audio output. this is a 2010 i7 imac and the audio worked great until a day ago.
Currently Being ModeratedAug 2, 2011 9:09 PM (in response to LT300000)
Weird! My issue was this: my speakers worked fine but when I plugged in my head phones, one ear was normal volume and the other was VERY quiet. I thought my jack was bad but when I followed the advice above, I found that the right channel was turned down really low. I am assuming the lion update scrambled something... luckily any of my issues have been resolved easily by reading on this forum.
Currently Being ModeratedAug 4, 2011 5:35 AM (in response to brendanmitchell)
Same issue here. Since upgrading to Lion, I have not been able to use headphones. The audio does not switch over from the built-in speakers. A fix for this would be tremendously appreciated.
2.3 GHz Core i7
4 GB memory
running OS 10.7
Currently Being ModeratedAug 4, 2011 11:50 AM (in response to LT300000)
MacBook 2010 Edition 4GB
Upgraded to LION earlier, had this problem.
Applications/Utilities/Audio MIDI Setup/Built-In Output/Output and in Format change from the default 2ch-24bit integer to any other format (say, 2ch-32bit float).
Currently Being ModeratedAug 29, 2011 9:44 AM (in response to brendanmitchell)
Just to keep the ball rolling. Same problem with the external audio here on my iMac. Internal speakers work but analog audio jack no longer appears to be recognized. Tried all the "fixes" above with no luck--system>pref>audio, Audio Midi Setup (which by the way, I don't even have an option for 32bit float), safe mode reboot, epram reboot, repair permissions. Heck, I even did the system restore reboot and ran disk repair and permissions repair from there, Linux command line interaction with audio files. I've also re-installed the OS 3 times out of desperation. Nothing helps.
I've now been fooled into installing Lion OS onto two machines. Both have had issues--different issues. Very rough release Apple. Shame shame.
If anyone out there knows what is really going on with this, do us all a favor and patch it in an update for Apple.
Currently Being ModeratedSep 2, 2011 3:05 AM (in response to brendanmitchell)
I`m having the same problem on my 2009 MBP. I have tried a couple of regular headphones and none of them will be recognized. However, there is no problem when i use the iphone headphones or iBeats. It seems like the mbp will only recognize headphones with a microphone. I noticed that these headsets have three of those black circles on the jack-plug, and normal headsets only have two.
Edit: Tried with an optical cable also, worked without a problem.
Currently Being ModeratedSep 8, 2011 1:52 PM (in response to brendanmitchell)
I have had the same problem on my Aluminium MB (Late 2008). Neither the jack or the internal speakers would work. After I restarted the internal speakers were working but the jack was still not. I read this post and then trued another restart and now both are working fine again. Hope that helps.
Currently Being ModeratedSep 9, 2011 10:21 AM (in response to brendanmitchell)
I solved (sort of) this issue for me today. It seems that if you have an ordinary stereo plug (the one with two dividers in contrast to three on the iphone headphones) you can only choose between external input OR external output.
So to get the external output working, you have to go to "System Settings" -> "Sound" and then at the bottom, set "Use audio port for" to Sound Output.
That did it for me at least...
Currently Being ModeratedSep 16, 2011 3:46 PM (in response to uram)
Same problem with disappearing audio. Upgraded a late 2009 Mini MB464LL. After Lion, all my sound is gone. This is my HTPC, so its a critical issue. Hope a solution appears soon