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lubuntu - Red light from headphone jack Macbook Pro - …
https://askubuntu.com/questions/997085/red-light-from-headphone-jack-macbook-pro
Asked3 years, 8 months ago Active3 years, 8 months ago Viewed690 times 1 I'm using Lubuntu 17.10 fully updated almost clean install on a Macbook Pro Retina late 2013. Audio is working perfectly fine through both inbuilt speakers and headphones. My headphone jack is sending a red light out constantly.
Ubuntu – No sound out of MacBook speakers & red LED in ...
https://itectec.com/ubuntu/ubuntu-no-sound-out-of-macbook-speakers-red-led-in-headphone-jack/
I have recently installed Ubuntu 11.04 on my Macbook and after a few days I am now getting very low sound from the speakers as well a red LED is glowing in the Headphone jack. The sound is perfect if I connect my headphones but if I use the speakers there is no output. I have also installed Windows and Mac OSX(Triple Boot).
Red light in headphone jack and no sound - Apple
https://discussions.apple.com/thread/3694502
1 Reboot your Mac (if you hear the 'ding' sond, then the speakers are physically OK) 2 If the problem still exists go to folder \Library\Preferences\Audio\ and delete the two files inside the folder. You should be asked to supply your account password to …
SOLVED: Audio jack problem, no speaker sound, red light ...
https://www.ifixit.com/Answers/View/8797/Audio+jack+problem,+no+speaker+sound,+red+light
The red light in the headphone jack means that the MacBook Pro thinks that an optical audio cable is plugged into the port. Try unplugging and replugging a headphone plug into the port several times. There is a tiny sensor inside the port that determines whether the port operates in optical or analog mode.
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