Michal Jaegermann <michal <at> harddata.com> writes:
That would be most likely
https://bugzilla.redhat.com/show_bug.cgi?id=781657
See comment #2 (and #3) in particular. It resolved that issue for me.
The procedure described worked for me exactly once, the first time I tried it.
After that, it doesn't work anymore, even though the file edit is persistent.
See
https://bugzilla.redhat.com/show_bug.cgi?id=781657#c8 . The other problem,
with grubby not updating grub.cfg, I can work around by recreating it with
grub2-mkconfig - it creates entries for all the kernels, including the latest
one. I'm guessing it's a grubby bug but haven't filed it yet - I want to see
the
exact error when the next kernel appears.