yes, grub-mkconfig should add Legacy AND/OR uefi entries according to the presence of grub-pc AND/OR grub-efi in the install.
(not only if it finds windows, whatever the systems it finds)
yes, grub-mkconfig should add Legacy AND/OR uefi entries according to the presence of grub-pc AND/OR grub-efi in the install.
(not only if it finds windows, whatever the systems it finds)