SUSE grub has
patches to "mount" this subvolume at boot time and the
grub configuration file as generated by SUSE will include commands
to
do it.
Thanks Andrei, I really appreciate that info as it explains why
other distros cannot boot when it is a subvolume.
I looked in my TW /boot/grub2/grub.cfg but don't see references to
mount the /boot/grub2/x86_64-efi subvolume.
I also grep'd in /etc/grub.d/* but still didn't find where it
does that mount.
Can you give me a pointer was to where you are referring in the grub
configuration?
Thanks!