Comment # 3 on bug 1159887 from Josef Reidinger

(In reply to Michael Chang from comment #2)
> (In reply to Josef Reidinger from comment #1)
> > that make sense for me.
> > 
> > Michael - just quick question, how to reset already set value that we set by
> > "grub-set-default" to use really the last one?
> 
> I believed the simple configuration [1] GRUB_SAVEDEFAULT is what you are
> looking for. And if you read the manual thoroughly, you'll see the caveat in
> the end. 
> 
> "This option relies on the environment block, which may not be available in
> all situations"
> 
> That is also saying we may have to detect either of the zfs, lvm and mdadm
> is in use by /boot and pop up warning whenever writable environment block
> not available.
> 
> [1]
> https://www.gnu.org/software/grub/manual/grub/grub.html#Simple-configuration
> 
> Thanks.

ah, fine so if we use GRUB_DEFAULT=saved and GRUB_SAVEDEFAULT='true'
then "grub-set-default" value is ignored, right? And if that environment block
is not available it will use that default instead?