avim (avisoftware123). It should have not been working with 4.9 as touch
pad. It was working as a mouse. E.g. with 4.9 you should not be able to
do scrolls and other gestures.

There are generally might be three cases with this touch pad:
1. The touch pad is not working at all, e.g. no cursor visible. This is due to 
three consecutive failed attempts to reset the hardware. This can happen with 
all the linux kernels < 4.10, it is a floating issue sometimes it happens on 
the same machine, sometimes not. The proper reset for this hardware need to be 
done with 1ms delay between device "power on" command and device "reset" 
command (this is implemented only in kernel >= 4.10)
2. The touch pad is working as a MOUSE. E.g. no scrolling or other gestures 
available. This will be the case with all the kernels < 4.10, when device reset 
happen to finish successfully.
3. The touch pad is fully working as a TOUCH PAD, with scrolling and other 
gestures support. This will be the case for all the kernels >= 4.10. Plus there 
will be no floating hardware reset issue.

Hope this helps

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https://bugs.launchpad.net/bugs/1646622

Title:
  TouchPad doesn't work ASUS x556uj

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