Comment # 6 on bug 1129950 from Guillaume GARDET

Updating grub to 2.04-rc1 (from home:michael-chang:devel/grub2) fixes the
problem.
May be related to https://bugzilla.opensuse.org/show_bug.cgi?id=1122614

So, it will be fixed once grub 2.04 final will be released and pushed to
Factory.