For those of us who hit this issue and are proficient programmers
(sarvatt, sforshee, laney, hint hint :), I suggest adding some debug
statements inside the src/eventcomm.c touch handling functions to see
exactly what is going on. The patch that RAOF added for this bug resets
the touch state when the device is re-enabled, which I think happens on
resume, so something is likely going wrong after that. Logging touch
count changes would be a good first start, since the touch count
determines whether the left or right clicks are emitted, and whether the
cursor is moved or two-touch scrolling occurs.

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https://bugs.launchpad.net/bugs/968845

Title:
  bcm5974 touchpad doesn't work after S3 on MacBookAir

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