After installing Ubuntu to my MBP, occasionally my headphone jack emits a red light, it still functions correctly but is somewhat annoying to have a red led blasting at my roommate late at night.

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    That would be the laser for the combo SPDIF output. Congrats on trying Ubuntu :) – You'reAGitForNotUsingGit Sep 27 '16 at 18:24

Simply open alsamixer on the terminal and mute the SPDIF channels.

The red light should disappear in a couple of minutes.

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