Alex, the 4.5-rc 32-bit kernels seem to have a problem initializing VCE.
The drm.debug boot option does not show more info as to what the problem 
is.
On 4.4 (tested with 4.4.1 and 4.4.2) kernels it is loading OK.

I have confirmed the regression on 4.5-rc2 and 4.5-rc4 kernels.

Thanks, Woody