It involves turning off the digital portion of the hw card (cirrus logic device in this case), and not changing the other hardware card or usb sound settings. Here are more details, where this solution that has worked permanently for weeks and is still working. I confirmed that sakell's solution above works on ubuntu 20.04 LTS in a macbook pro a1502 (year 2014), where the solution of installing QasMixer is in the youtube video link given by sakell: įor a macbook pro, a1502 (2014), I tried many solutions including directly using alsa mixer, etc, and editing files and directory settings, but none of them worked to turn off the red light that would turn on at the headphone port for the digital optical audio output, when there was no digital audio used, and when the ubuntu sound settings were all set to analog output speakers.
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