Comment 13 for bug 1795292

Same here, touchpad not working in Ubuntu 18.04... on every kernel i tried

curious facts:

sudo acpidump | grep -C3 ELAN

 5B10: 39 5F 48 49 44 00 A0 13 93 54 43 50 44 0A 02 A4 9_HID....TCPD...
  5B20: 0D 53 59 4E 41 33 32 35 35 00 A0 13 93 54 43 50 .SYNA3255....TCP
  5B30: 44 0A 03 A4 0D 41 4C 50 53 31 32 31 45 00 A4 0D D....ALPS121E...
  5B40: 45 4C 41 4E 34 36 39 44 00 08 45 49 43 30 11 21 ELAN469D..EIC0.!
  5B50: 0A 1E 8E 19 00 01 00 01 02 00 00 01 06 00 80 1A ................
  5B60: 06 00 15 00 5C 5F 53 42 2E 49 32 43 44 00 79 00 ....\_SB.I2CD.y.
  5B70: 08 53 49 43 30 11 21 0A 1E 8E 19 00 01 00 01 02 .SIC0.!.........

You can see something related to ALPS

In windows 10 it was not working too but installing Alps drivers solved the problem,

dmesg | grep i2c

[ 1.290277] i2c /dev entries driver
[ 2.164938] i2c_hid i2c-ALPS121E:00: i2c-ALPS121E:00 supply vdd not found, using dummy regulator
[ 3.196351] i2c_designware AMDI0010:01: controller timed out