Similar to @Flavio Henrique Bastos, @Paul Müller, it happened on my Lenovo X1 Yoga, running the touchscreen with libinput driver (https://bugs.launchpad.net/ubuntu/+source/xf86-input-wacom/+bug/1774242).
Disabling/enabling the touch screen resolved the problem:
xinput --set-prop "Wacom Pen and multitouch sensor Finger" "Device Enabled" 0 xinput --set-prop "Wacom Pen and multitouch sensor Finger" "Device Enabled" 1
Similar to @Flavio Henrique Bastos, @Paul Müller, it happened on my Lenovo X1 Yoga, running the touchscreen with libinput driver (https:/ /bugs.launchpad .net/ubuntu/ +source/ xf86-input- wacom/+ bug/1774242).
Disabling/enabling the touch screen resolved the problem:
xinput --set-prop "Wacom Pen and multitouch sensor Finger" "Device Enabled" 0
xinput --set-prop "Wacom Pen and multitouch sensor Finger" "Device Enabled" 1