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Headphones issue

Please note that the following procedure doesn't require disabled SIP as it installs the executable inside /usr/local/bin :")

Problem

Due to a combojack (microphone with headphones combined jack) in this laptop, if you connect a pair of headphones, it can happen that you'll hear a crackling sound coming from the jack.

Solution

Extract your sound card codec dump (e.g. use HdaCodecDump.efi OpenCore tool) and write down Pin-ctls of Mic Line-In.
You'll need them for editing the configuration file of ALCPlugFix Swift.

In my case I have the following Pin-ctls:

  • 0x19 has Pin-Ctls 0x24
  • 0x1a has Pin-Ctls 0x20

Please note that starting from AppleALC 1.5.5+, you'll need the boot-arg alcverbs=1 in order for ALCPlugFix-Swift to work.

At this point, download the latest release of AppleALC, open a terminal window and drag alc-verb executable and complete the command as follows:

alc-verb 0x(pin_complex_number) 0x707 0x(headphones pin-ctls)

In my case:

  • alc-verb 0x19 0x707 0x24
  • alc-verb 0x1a 0x707 0x20

If the above commands fixed the crackling sound coming from the combojack, edit alcplugfix_config.plist as depicted below:

ALCPlugFix-Swift config

Finally, you'll have to install a daemon called ALCPlugFix Swift. Follow the install instructions on the repo, and be sure to drag alcplugfix_config.plist.

P.S. place your alcplugfix_config.plist into a secure place that you'll never delete/forget, like a dotfile in your Users directory

After rebooting your computer, you'll have a working audio combojack :")