Comment # 41 on bug 93826 from iuno@posteo.net

I just downloaded and tried with a Linux Mint 18 image. Using kernel 4.4.0, the
problem definitely DID exist back then, in contrast to what comment #0
suggested. So bisecting from 4.4 would be useless.

Are the DCEs affected by firmware files? Is it possible that the problem was
pulled in from there?