I have the same problem, almost the same configuration:
$ sudo dmidecode -s bios-version sudo dmidecode -s bios-release-date
66CN55WW
02/28/2013
$ uname -a
Linux yoga 3.13.0-38-generic #65-Ubuntu SMP Thu Oct 9 11:36:50 UTC 2014 x86_64
x86_64 x86_64 GNU/Linux
I must add that I use Ubuntu 14.10, except for the kernel which I kept
from an older ubuntu version (because of the Yoga's wifi card, other
problem)
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https://bugs.launchpad.net/bugs/1227996
Title:
[Lenovo IdeaPad Yoga 13] ubuntu doesn't know about Yoga screen
rotation keycodes: atkbd serio0: Use 'setkeycodes e03e keycode' to
make it known.
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