I have a Lenovo Yoga 3 11  (product code 80J8001YGE, based on Intel Core M-5Y10c)

Up to kernel 4.2 (tried with Ubuntu 15.10) there were no problems at boot time, but the accelerometer module did not work (in_accel_x_raw, in_accel_y_raw and in_accel_z_raw always returned a fixed value).

Since kernel 4.4 (I'm using Ubuntu 16.04) accelerometer does work, but the system randomly (not always) freezes at boot time, but only on cold boots - if I (finally) manage to do a cold boot, then all subsequent reboots give no problems. 

I have found a workaround by blacklisting hid_sensor_hub module (I have no cold boot problems any more), and by loading such module through a bash script only after a reboot (see my scripts and the README file at https://github.com/alpianon/screenrotation)

With such script, I load the module only after a reboot and only when lightdm service is started; if I load it before, very often the dependent kernel modules (hid_sensor_als,
hid_sensor_gyro_3d, hid_sensor_rotation, hid_sensor_magn_3d, hid_sensor_accel_3d, hid_sensor_incl_3d) are not loaded (so the accelerometer does not work).

I tried to find some information on syslog, but apparently when the system freezes on cold boots, no log entry is saved in syslog (as if the boot never happened).