Tablet Mode Switch on HP Elite x2 1013 G3 is unreliable:

https://bugzilla.kernel.org/show_bug.cgi?id=204719
https://bugzilla.kernel.org/show_bug.cgi?id=204739

Keyboard+touchpad is external:
http://h10032.www1.hp.com/ctg/Manual/c06077534 (page 12)

(cherry picked from commit 3c13dd9c)