I have a Thinkpad X1 Carbon 5th gen, and am also affected. Modprobing
psmouse also temporarily fixes for me (but if comes back if I close the
lid of my laptop and wake it up again), and adding the
synaptics_intertouch option in grub also seems to prevent it from coming
back.
It only started happening in the last few days, and I generally install
updates whenever they are available, though I haven't been using my
laptop every day (so it may have started happening in the last week or
two at most). I'm surprised it did only start recently, given this bug
was filed a while back.
$ uname -a
Linux x1carbon 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 18.04.1 LTS
Release:18.04
Codename: bionic
$ sudo apt-get install libinput-tools & sudo libinput list-devices
Device: SynPS/2 Synaptics TouchPad
Kernel: /dev/input/event6
Group:8
Seat: seat0, default
Size: 100x56mm
Capabilities: pointer gesture
Tap-to-click: disabled
Tap-and-drag: enabled
Tap drag lock:disabled
Left-handed: disabled
Nat.scrolling:disabled
Middle emulation: disabled
Calibration: n/a
Scroll methods: *two-finger edge
Click methods:*button-areas clickfinger
Disable-w-typing: enabled
Accel profiles: none
Rotation: n/a
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https://bugs.launchpad.net/bugs/1722478
Title:
Two-finger scrolling no longer works after resuming from suspend
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