Coiby Xu (coiby) 
>1. When the touchpad works by setting pin's direction=out, you could see lots 
>of "no data" message ("IRQ triggered but there's no data") keeping popping up 
>after moving your finger away from the touchpad, am I correct?

no, wrong. when run : echo out > direction,
dmesg say :
[  133.854926] i2c_hid i2c-MSFT0001:00: i2c_hid_get_input: IRQ triggered but 
there's no data
only one time,
then my touchpad can work.
no keeping popping up after moving your finger away from the touchpad.

it's only one line .


>2. When pin's direction=out, does only one new "no data" message or multiple 
>ones appear on the screen when you toggle the pin value?

when run : echo out > direction,
dmesg show one time no data msg.no more, 
then change pin value,to 0 or to 1,
no msg output.

but ,when value = 1, touchpad not work,
when value =0,touchpad can work.

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https://bugs.launchpad.net/bugs/1887190

Title:
  MSFT Touchpad not working on Lenovo Legion-5 15ARH05

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