Comment 20 for bug 1836176

There's a better workaround (method 3) now suggested on the arch wiki page:
https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_X1_Yoga_(Gen_3)

It works with Ubuntu as well; you can test it when the touch screen isn't responding with:

sudo apt install acpi-call-dkms; sudo modprobe acpi_call; echo '\\_SB.PCI0.LPCB.EC._Q2A' | sudo tee /proc/acpi/call