Comment # 1 on bug 1127468 from Jiri Srain

During installation, grub2-mkconfig prints following:

2019-02-25 11:06:32 <1> linux-fcss(3667) [Ruby] lib/cheetah.rb:158 Executing
"/usr/sbin/grub2-mkconfig -o /boot/grub2/grub.cfg".
2019-02-25 11:06:32 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output: Generating grub configuration file ...
2019-02-25 11:06:33 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:33 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:33 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:33 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:34 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output: Found theme: /boot/grub2/themes/openSUSE/theme.txt
2019-02-25 11:06:34 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:34 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:34 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output: Found linux image: /boot/vmlinuz-4.12.14-lp151.21-default
2019-02-25 11:06:34 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output: Found initrd image: /boot/initrd-4.12.14-lp151.21-default
2019-02-25 11:06:35 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:35 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:35 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:37 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:37 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:38 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output: Found Windows Boot Manager on
/dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
2019-02-25 11:06:38 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:38 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output:   WARNING: Failed to connect to lvmetad. Falling back to device
scanning.
2019-02-25 11:06:38 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output: Found openSUSE Leap 15.0 on /dev/mapper/system-system1
2019-02-25 11:06:40 <3> linux-fcss(3667) [Ruby] lib/cheetah.rb:206 Error
output: done

The same durig the later configuration is without those WARNING lines. Michael,
can it be the reason why the generated menu does not include the other
operating systems even if they seem to have been detected?