This has not worked with any kernel I've tried, from 4.15 to 4.18 to the
upstream 4.19 you linked to.
Here's some relevant dmesg output from the v4.19:
[ 1.390898] i2c_hid i2c-ELAN469D:00: i2c-ELAN469D:00 supply vdd not found,
using dummy regulator
[ 1.390914] i2c_hid i2c-ELAN469D:00: Linked as a consumer to regulator.0
[ 1.390915] i2c_hid i2c-ELAN469D:00: i2c-ELAN469D:00 supply vddl not found,
using dummy regulator
[ 2.420872] i2c_designware AMDI0010:01: controller timed out
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1795292
Title:
ELAN469D touch pad not working
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