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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You received this bug notification because you are a member of Desktop
Packages, 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
Status in “xserver-xorg-input-evdev” package in Ubuntu:
Confirmed
Bug description:
Touchscreen is unresponsive on fresh 13.04 Ubuntu installation. All
other devices work.
Touchscreen shows as working and 'states' are correct for any xinput
--list off of a cold boot.
However, if I (at any point) "Suspend" the system, then awaken it, the
Touchscreen immediately functions properly.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-evdev/+bug/1180881/+subscriptions
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