Ubuntu kernels
4.2.0-19.23 - sixth try, tagged in xenial repo: good
4.2.0-41.48 - from wily deb package: good
4.2.8-ckt12 - mainline PPA: good
4.3.0 - mainline PPA: bad
4.3.0-0.9 - fifth try: bad
4.3.0-1.10 - fourth try: bad
4.3.0-2.11
4.3.0-3.12 - third try: bad
4.3.0-4.13
4.3.0-5.14
4.3.0-5.15
4.3.0-5.16 - second try: bad
4.3.0-6.17
4.3.0-7.18
4.4.0-1.15
4.4.0-2.16
4.4.0-3.17
4.4.0-4.18
4.4.0-4.19
4.4.0-5.20 - first try: bad
4.4.0-6.21
4.4.0-7.22
4.4.0-8.23
4.4.0-9.24
4.4.0-10.25
4.4.0-11.26
4.4.0-12.27
4.4.0-12.28
4.4.0-13.29
4.4.0-14.30
4.4.0-15.31
4.4.0-16.32
4.4.0-17.33
4.4.0-18.34
4.4.0-19.35
4.4.0-20.36
4.4.0-21.37 - 16.04 live DVD: bad
4.4.0-28.47 - first update: bad
4.4.0-31.50 - next update: bad

linux-stable git
v4.2.8 - good
v4.3 - bad
above are initial git bisect range