I searched the WWW for any kind of solution to the trackpad not being
recognized.  There are several months of similar questions, but no
resolution.  Until this patch was made public/known.

Further discussion here:


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  Additional initializer needed to recognize trackpad on Lenovo Yoga 720

Status in linux package in Ubuntu:

Bug description:
  There's just a 1 line patch required, to add an initializer to array
  of structs scanned to match up the device ID with driver.

  The PR is here:


  I've applied the patch and created and booted from a custom kernel and
  it works great.

  The laptop is wonderful running Ubuntu:  I7 7700HQ, 16G RAM, 500G SSD,
  4K touch screen, decent I/O ports.

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