Document known issue: Keyboard and trackpad do not work on recent MacBook Pro models

Originally created by @Drypht on #13576 (Redmine)

MacBook Pro 15-inch 2016 with touch bar (model MacBookPro13,3)

Tails boots to greeter but neither the trackpad nor keyboard work, so the system is unusable without external peripherals.

Feature Branch: doc/13576-known-issues-recent-mbp

If you used to be affected by this issue and the current Tails release fixes this problem, please let us know.

Edited Jan 26, 2021 by intrigeri

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