Caveat: I'm far from an advanced user. I like Ubuntu for web development and casual use, and generally try to figure things out as the need arises.
After running a routine update (
apt upgrade) and later restarting my ThinkPad Yoga 11e (3rd generation, I believe), my touchpad has stopped working completely. It's listed when I run
xinput list, but nothing I've tried so far has managed to restore functionality.
The touchscreen and keyboard still work as expected, and I haven't had a chance yet to test it with Ubuntu booted from a USB stick. --Edit 1: after booting from a USB stick, it appears
xinput is showing the wrong device for my touchpad.
Context: at the time it stopped working, I was running 18.04.1 with Unity (
ubuntu-unity-desktop), LightDM, and
xserver-xorg-input-synaptics. Thinking that Unity and the synaptics driver might have something to do with it, and not getting any helpful search results with so many key phrases, I uninstalled them. Currently running with GNOME, GDM, and
--Edit 2: reinstalled Ubuntu and the touchpad worked, then updated and it's back to being completely unresponsive. Prior to updating,
xinput list properly showed "SynPS/2 Synaptics TouchPad"; after updating, it once again shows "Synaptics s3203_ver5".
--Edit 3: wiped the drive and reinstalled 16.04. Same results: touchpad worked after installation, failed after updating. Same
xinput list results. Reinstalled 18.04 again to start over, and ruled out the kernel as the problem.
Synaptics s3203_ver5 --Edit 1: should be SynPS/2 Synaptics TouchPad