Comment # 76 on bug 913996 from Borislav Petkov

(In reply to Peter Kirchge�ner from comment #75)
> This is how the script
> /usr/lib/module-init-tools/regenerate-initrd-posttrans looks on my machine
> around line 46:
> 
> 
> if test -e "$dir/all"; then
>         rm "$dir"/*
>         run_mkinitrd_setup
>         mkinitrd
>         exit
> fi
> 
> Here mkinitrd is called without its path /sbin. Other places in the script
> call it as /sbin/mkinitrd.

Hmm, I see another invocation further down which is done without
"/sbin/" prepended either.

Ok, try adding "/sbin/" before those two and install *only* the
ucode-amd package - *not* the new kernel, i.e. without installing
kernel-desktop-3.16.7-7.

Then boot into the old kernel and once the box is up, do:

echo 1 > /sys/devices/system/cpu/microcode/reload

Then do:

dmesg | grep -i microcode

and paste the output from that command here. I want to see whether
microcode gets applied at all with the old kernel.

Once /usr/lib/module-init-tools/regenerate-initrd-posttrans is fixed,
you can try installing the new kernel and see whether it'll boot.
Judging by the current observations though, it should hang.

Thanks.