*** This bug is a duplicate of bug 1825699 ***
    https://bugs.launchpad.net/bugs/1825699

According to the error of dmesg, this bug should be a duplicate of
#1825699 (about ThinkPad L580), if we can't fix it to make it have
reliable i2c transfer, we might add this touchpad to
i2c_blacklist_pnp_ids. But it is weird that we have a ThinkPad L480 in
the Beijing office, which doens't have any touchpad issues after
installing the ubuntu 19.04.

Need more investigation. I changed the bug title in order to let other
L480 users report the bug if they also have touchpad issues after
installing 19.04.

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https://bugs.launchpad.net/bugs/1825996

Title:
  Touchpad not working on Lenovo ThinkPad L480 after upgrade to 19.04

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