For Dell XPS, try remove pinctrl_sunrisepoint driver, it should work.
   sudo rmmod pinctrl_sunrisepoint

There is a discussion and a patch for this issue here
https://bugzilla.kernel.org/show_bug.cgi?id=176361

** Bug watch added: Linux Kernel Bug Tracker #176361
   http://bugzilla.kernel.org/show_bug.cgi?id=176361

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https://bugs.launchpad.net/bugs/1275416

Title:
  touchscreen do not work after suspend/resume

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