Gletscher, I built a new kernel for bug 1305522, and I think it might be 
related to your issue.
Could you try this kernel and see if it helps?
Thanks.
http://people.canonical.com/~acelan/bugs/lp1305522/20140515/

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Title:
  Dell XPS 13 (haswell) touchscreen works only after suspend-wakeup
  cycle on BATTERY (no AC)

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