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

** Bug watch added: Linux Kernel Bug Tracker #176361

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  touchscreen do not work after suspend/resume

Status in xinput package in Ubuntu:

Bug description:
  My laptop (Thinkpad X200T with multi-touch screen) installed the
  'Trusty' ubuntu 14.04 (64bits), touchscreen works well after cold
  boot! But after suspend/resume, touchsreen do not response. Execute
  'xsetwacom --list' in terminal, there is nothing, both 'wacom touch'
  and 'wacom stylus' are gone. I must logout and relogin or reboot, the
  touchscreen can be normal again.

  By the way, the same problem happens in the 'Saucy' ubuntu 13.10
  (64bits). But in 'Raring' ubuntu 13.04 (64bits), this problem does no
  exist, touchscreen WORKS WELL after suspend/resume.

  This Thinkpad X200T updated the newest BIOS, and keep ubuntu OS up to

  Please fix this bug, because 14.04 is a very important version for
  touchscreen devices, and i think 'suspend/resume' function is
  important too. Thanks!

  Feb 4, 2014 update

  Oh I'm sorry, I find a new change for this bug that I never noticed

  I keep Trusty ubuntu up to date(Feb 4, 2014). When the OS's first boot
  from cold boot, touchscreen works well. Then if suspend/resume for the
  first time, touchscreen will not response. At this moment, logout and
  relogin, touchscreen works well again even after suspend/resume.

  Simply put, touchscreen do not response only after the first
  suspend/resume since a cold boot. Once the OS logout and relogin,
  touchscreen will work well after any suspend/resume. The key point is
  that the OS must logout and relogin for at least one time.

  Always keep 'Trusty' ubuntu OS updated.

  that's a strange bug

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