Bug#1054074: update
Now, two days after, touchpad works normal again. Why? Don't know which
is worse than if it still wouldn't work.
what happened?
seems there is another bug: when I happen to plug the usb-c charger
while in standby, system crashes after wakeup. After rebooting,
everything was fine with the touchpad. Maybe just a coincidence?
dmesg shows this now:
$ sudo dmesg | grep -i mouse
[ 1.886340] mousedev: PS/2 mouse device common for all mice
[ 2.689681] psmouse serio1: elantech: assuming hardware version 4
(with firmware version 0x5f3001)
[ 2.704141] psmouse serio1: elantech: Synaptics capabilities query
result 0x90, 0x18, 0x10.
[ 2.719334] psmouse serio1: elantech: Elan sample query result 00, 1b, 97
[ 2.734455] psmouse serio1: elantech: Elan ic body: 0x14, current fw
version: 0x2
[ 2.764542] psmouse serio1: elantech: Trying to set up SMBus access
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