Public bug reported:

Have Apple Macbook pro 8,1. With Trusty devel, very occasionally (i.e.
twice in the last 3 weeks) my trackpad has completely stopped
functioning for no reason I can determine.

>From then on, dmesg is full of these messages:

bcm5974: bad trackpad package, length: 8

Removing and re-loading the bcm5974 kernel module fixes the problem.
Sorry I've no better information to supply.

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1257547

Title:
  [bcm5974] Apple touchpad fails to respond, dmesg contains multiple
  mesages of form: bcm5974: bad trackpad package, length: 8

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