> The driver policy file? It is safe to just remove it?
Yes. It is a left-over from something. It is old and it is certainly not
needed, it is just annoying.
I had it on my Wheezy systems and removed it during the upgrade to
Jessie, because it was causing the same problems you had.
> Btw, isn't a bit dangerous to use -kall? The documentation says the kall
> will make the change affect all the initramfs on the machine. If the one
> actually working gets modified and starts to have problems I could not be
> able to boot for good, couldn't?
In theory. But this change just makes your initramfs more universal and
thus more likely to boot on different hardware than breaking anything.