Indeed, the backport of fa90035 is faulty (and there's another missing mei driver commit as well). Pali, please test this fix (the top two patches) and advise whether that fixes the problem:
http://kernel.ubuntu.com/git/kamal/ubuntu-trusty.git/log/?h=pali-1450813
845a0dc UBUNTU: Fix "mei: me: release hw from reset only during the reset flow" cce3208 mei: me: fix hw ready reset flow
Indeed, the backport of fa90035 is faulty (and there's another missing mei driver commit as well). Pali, please test this fix (the top two patches) and advise whether that fixes the problem:
http:// kernel. ubuntu. com/git/ kamal/ubuntu- trusty. git/log/ ?h=pali- 1450813
845a0dc UBUNTU: Fix "mei: me: release hw from reset only during the reset flow"
cce3208 mei: me: fix hw ready reset flow