Using wireshark to monitor the usb traffic, we'll find the touchscreen becomes 
abnormal after systems sends the IDLE command to it.
But the touchscreen could revive after sending some other commands, such as  
GET_DESCRIPTOR.

I'll build a test driver soon, but I need to build a list for the affected usb 
id.
On this bug, there are 2 IDs
   06cb:1d10
and mine is
   06cb:0af8

Please reply if your borken touchscreen ID is not listed above.

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https://bugs.launchpad.net/bugs/1180881

Title:
  Touchscreen only works after suspend/resume on Lenovo ideapad P400
  Touch

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