xps 13 2015 - ubuntu 14.04.2 (stock) - 3.19.0-20 kernel - A04 bios
Everything seems great, save for the 1-2x a day where a key will go into repeating type mode all by itself. Most of the time it's "s" but I've seen it happen with at least one other key (which is infrequent enough that I forget which one it is).
I cannot deduce if this is software or hardware since it appears limited to certain keys.
The same happens to me with Ubuntu 15.04, often 'd' or Cursor right. Infrequent but disturbing enough that I started to web search for it. No solution or other hints to what the cause may be.
Update: this is still happening with the A05 bios and the ubuntu 14.04.3 enablement kernel (3.19.0-25).
Update: this is still happening with the A07 bios on ubuntu 14.04.3 with the prerelease enablement kernel for the next LTS (4.2.0-27).
Addendum: since there are more XPS13's floating around now, wanted to clarify its the 9343.
I can confirm this for Ubuntu 16.04 on XPS 13 9360.
I wonder if Dell will ever fix this