There is a patch in ALSA for the Dell XPS 13 HDA sound system. 
http://mailman.alsa-project.org/pipermail/alsa-devel/2015-March/089789.html

This patch appears to have a bug. It refers to codec->core.version_id 
where codec is a hda_codec structure. Unfortunately that structure has no core
member. It does have a version_id member, which is probably what was meant in
this patch.  So replacing this with codec->version_id does compile and I have
reports that it also makes the sound work on the XPS13



William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
UBC, Vancouver,BC  |   Program in Cosmology |     un...@physics.ubc.ca
Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/

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