Just to make things clear: media_build has nothing to do with the issue from my original post. I made 2 versions (media_build and non-media_build) because some DVB devices only work with media_build drivers and some devices for whatever reason only work with default kernel drivers.
The issue occur with and without media_build as long as the build is based on 4.9 kernel.
Kernel 4.10 has the same issue as 4.9 - it does not fix anything. Only kernel 4.8 and earlier work as expected.