Here's what I see in the syslog when the button is pressed:

Dec 12 17:32:51 ubuntu-phablet repowerd[2423]: DefaultStateMachine: 
handle_user_activity_changing_power_state
Dec 12 17:32:51 ubuntu-phablet kernel: [30240.423231]  [0:  irq/6-arizona: 
1238] [c0] arizona 1-001a: MICDET: 0x7
Dec 12 17:32:51 ubuntu-phablet kernel: [30240.423357]  [0:  irq/6-arizona: 
1238] [c0] arizona 1-001a: Mic button detected
Dec 12 17:32:51 ubuntu-phablet kernel: [30240.423416]  [0:  irq/6-arizona: 
1238] [c0] arizona 1-001a: Mic button detected: lvl=1, ffs(lvl)-1=0
Dec 12 17:32:51 ubuntu-phablet kernel: [30240.423488]  [0:  irq/6-arizona: 
1238] [c0] arizona 1-001a: Mic button detected: key=226
Dec 12 17:32:51 ubuntu-phablet repowerd[2423]: DefaultStateMachine: 
handle_user_activity_extending_power_state
Dec 12 17:32:51 ubuntu-phablet kernel: [30240.604666]  [0:  irq/6-arizona: 
1238] [c0] arizona 1-001a: MICDET: 0x403

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https://bugs.launchpad.net/bugs/1608246

Title:
  Does not work button on the headphones to answer call's  [Meizu PRO 5]

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