Public bug reported:

[Impact]
LG I2C touchscreen stops working after reboot.

[Fix]
Disable runtime PM for the touchscreen, which doesn't work well with 
consecutive ON/SLEEP commands.

[Test]
The touchscreen works well after reboot, when runtime PM is disabled.

[Regression Potential]
None. This is a new device and the fix is limited to this particular device.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1805085

Title:
  Fix and issue that LG I2C touchscreen stops working after reboot

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