More finding, if suspend/resume doesn't work for you, try the following steps
cd /sys/devices/pci0000:00
find -name control | xargs -I '{}' sudo sh -c "echo on > '{}'"
sudo pm-suspend
It will turn on the power for all devices, more precisely you can just turn on
the usb host chip's power
cd /sys/devices/pci0000:00/0000:00:14.0
find -name control | xargs -I '{}' sudo sh -c "echo on > '{}'"
sudo pm-suspend
It works for me every time, so it's more like a power management issue
from Synaptics touchscreen firmware.
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which is subscribed to xserver-xorg-input-evdev in Ubuntu.
https://bugs.launchpad.net/bugs/1180881
Title:
Touchscreen only works after suspend/resume on Lenovo ideapad P400
Touch
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