Today (9.Feb) I ran the Ubuntu software updater, and rebooted my Thinpad X1 carbon (6gen) (standard Ubuntu 18.04.1 (xorg); kernel
After that, my touchpad stopped working. That is, the mouse cursor is unresponsive; the only thing that actually works is pressing the left "mouse" button on the trackpad. However, it seems that from time to time (I don't recognize a pattern) the touchpad gets responsive for a second or two. In rare cases, it seems to go back to full functionality, but once I reboot, it's unresponsive again. My external bluetooth mouse works fine.
Does anyone know what might have gone wrong, and how I could fix this?
EDIT: For some reason, disabling the trackpoint in the BIOS-settings did the trick, the touchpad is usable again. However, it "feels" a bit different, and I notice that I cannot "click & drag" anymore.