MacOS – Earphones problem/ sleep mode/ MacBook Air

There does not seem to be a way for a program to get notified when the lid is closed. However, the state of the lid can be monitored periodically (and in this particular case, every second) and actions taken based on the lid state.

I do not know of any program that can provide a complete solution for your need, but you can use the following information to build a solution yourself.

1. Download this clamshellstate.pl perl script

2. You can run it in Terminal (under /Applications/Utilities) like:

   ./clamshellstate.pl 1  
   

   to get an output like "Open" or "Closed" indicating the current lid state

3. Create a shell script like (substitute script-to-run with a shell script you'd like to run):

   ./clamshellstate.pl 1 | grep Closed > /dev/null && *script-to-run*
   

4. Configure this script to run once every second using launchd.plist. Or use Lingon to easily configure launchd.plist.

Note: Instead of clamshellstate.pl, you can also use the following command in Terminal:

ioreg -r -k AppleClamshellState | grep '"AppleClamshellState" = Yes' | cut -f2 -d"="

to get a "Yes" for the closed state and a "No" for the open state.

It needs to be plugged into the mains to do it.

To reset the SMC:

1. Shut down the computer.
2. Plug in the MagSafe or USB-C power adapter to a power source and to your computer.
3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
4. Release all the keys and the power button at the same time.
5. Press the power button to turn on the computer.

Source : Apple KB - Resetting the System Management Controller (SMC) on your Mac