Sometimes, when I'm using my macbook, Zoom in and out suddenly stops working. Smart zoom also stops working. Restarting hidd (killall -KILL hidd) does not solve the problem. The only thing that works is to go into System Preferences, uncheck Zoom in and out, wait a few seconds, and then check it again.

What processes are responsible for the trackpad? Is there a terminal command I can use to reset the trackpad system?

MacBook Pro (13-inch, 2017, Four Thunderbolt 3 Ports); macOS High Sierra 10.13.6

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