Comment 7 for bug 1803600

I have Lenovo L580. And a similar issue. The install image written to the USB drive worked fine, but after installation touchpad simply did not work. I've tried everything suggested (utilizing some google searches ...), including kernel parameters, blacklisting various i2c hid modules, and all the combinations, but nothing. It's a fresh 18.10 install, I have no idea if it would work with previous versions, but I rather wouldn't downgrade, if this bug is expected to be fixed.

In my case, I see this in dmesg:

[ 2.418397] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x5f3001)
[ 2.440307] psmouse serio1: elantech: Synaptics capabilities query result 0x90, 0x18, 0x10.
[ 2.456358] psmouse serio1: elantech: Elan sample query result 00, 22, c8
[ 2.471110] psmouse serio1: elantech: Trying to set up SMBus access
[ 3.054187] elan_i2c 2-0015: 2-0015 supply vcc not found, using dummy regulator
[ 3.066012] elan_i2c 2-0015: failed to get resolution: -71
[ 3.066039] elan_i2c: probe of 2-0015 failed with error -71

Interestingly, sometimes the four first lines lines (grep'ing all lines from dmesg containing strig 'elan'), and not the rest. But it can be, because I tried to disable/enable touchpad in BIOS to see there is a difference.