Tentokrát to byla moje chyba, spustil jsem aktualizace, protože mezi nima byl i grub, doufaje v nějakou změnu, a nepřekontroloval jsem si to nastavení v /etc/default/grub a on vrátil to nastavení toho UUID. Tak jsem to zase odkomentoval, vygeneroval a vylezlo toto: 
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="${saved_entry}"
if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi
function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}
function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}
if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
insmod part_msdos
insmod ext2
set root='hd0,msdos2'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2 --hint='hd0,msdos2'  8d84c8e4-e91e-4320-bcc1-38bd82913eb4
else
  search --no-floppy --fs-uuid --set=root 8d84c8e4-e91e-4320-bcc1-38bd82913eb4
fi
    font="/usr/share/grub2/unicode.pf2"
fi
if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=cs_CZ
  insmod gettext
fi
terminal_output gfxterm
insmod part_msdos
insmod ext2
set root='hd0,msdos2'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2 --hint='hd0,msdos2'  8d84c8e4-e91e-4320-bcc1-38bd82913eb4
else
  search --no-floppy --fs-uuid --set=root 8d84c8e4-e91e-4320-bcc1-38bd82913eb4
fi
insmod gfxmenu
loadfont ($root)/boot/grub2/themes/openSUSE/ascii.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans-Bold14.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans10.pf2
loadfont ($root)/boot/grub2/themes/openSUSE/DejaVuSans12.pf2
insmod png
set theme=($root)/boot/grub2/themes/openSUSE/theme.txt
export theme
if [ x${boot_once} = xtrue ]; then
  set timeout=0
elif sleep --interruptible 0 ; then
  set timeout=2
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'openSUSE 12.3' --class 'opensuse-12-3' --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-8d84c8e4-e91e-4320-bcc1-38bd82913eb4' {
   load_video
   set gfxpayload=keep
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='hd0,msdos2'
   if [ x$feature_platform_search_hint = xy ]; then
     search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2 --hint='hd0,msdos2'  8d84c8e4-e91e-4320-bcc1-38bd82913eb4
   else
     search --no-floppy --fs-uuid --set=root 8d84c8e4-e91e-4320-bcc1-38bd82913eb4
   fi
   echo   'Loading Linux 3.7.10-1.1-desktop ...'
   linux   /boot/vmlinuz-3.7.10-1.1-desktop root=/dev/sda2   resume=/dev/sda1 splash=silent quiet showopts
   echo   'Loading initial ramdisk ...'
   initrd   /boot/initrd-3.7.10-1.1-desktop
}
submenu 'Advanced options for openSUSE 12.3' $menuentry_id_option 'gnulinux-advanced-8d84c8e4-e91e-4320-bcc1-38bd82913eb4' {
   menuentry 'openSUSE 12.3, with Linux 3.7.10-1.1-desktop' --class 'opensuse-12-3' --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.7.10-1.1-desktop-advanced-8d84c8e4-e91e-4320-bcc1-38bd82913eb4' {
      load_video
      set gfxpayload=keep
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='hd0,msdos2'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2 --hint='hd0,msdos2'  8d84c8e4-e91e-4320-bcc1-38bd82913eb4
      else
        search --no-floppy --fs-uuid --set=root 8d84c8e4-e91e-4320-bcc1-38bd82913eb4
      fi
      echo   'Loading Linux 3.7.10-1.1-desktop ...'
      linux   /boot/vmlinuz-3.7.10-1.1-desktop root=/dev/sda2   resume=/dev/sda1 splash=silent quiet showopts
      echo   'Loading initial ramdisk ...'
      initrd   /boot/initrd-3.7.10-1.1-desktop
   }
   menuentry 'openSUSE 12.3, with Linux 3.7.10-1.1-desktop (recovery mode)' --class 'opensuse-12-3' --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-3.7.10-1.1-desktop-recovery-8d84c8e4-e91e-4320-bcc1-38bd82913eb4' {
      load_video
      set gfxpayload=keep
      insmod gzio
      insmod part_msdos
      insmod ext2
      set root='hd0,msdos2'
      if [ x$feature_platform_search_hint = xy ]; then
        search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2 --hint='hd0,msdos2'  8d84c8e4-e91e-4320-bcc1-38bd82913eb4
      else
        search --no-floppy --fs-uuid --set=root 8d84c8e4-e91e-4320-bcc1-38bd82913eb4
      fi
      echo   'Loading Linux 3.7.10-1.1-desktop ...'
      linux   /boot/vmlinuz-3.7.10-1.1-desktop root=/dev/sda2  showopts apm=off noresume edd=off powersaved=off nohz=off highres=off processor.max_cstate=1 nomodeset  x11failsafe
      echo   'Loading initial ramdisk ...'
      initrd   /boot/initrd-3.7.10-1.1-desktop
   }
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/20_memtest86+ ###
### END /etc/grub.d/20_memtest86+ ###
### BEGIN /etc/grub.d/20_ppc_terminfo ###
### END /etc/grub.d/20_ppc_terminfo ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
### BEGIN /etc/grub.d/90_persistent ###
### END /etc/grub.d/90_persistent ###
To hlavní je asi změněné na sdx, ale pořád je tam na můj vkus i dost těch UUID ... no jdu to zkusit naklonovat. Ale moc tomu nevěřím. 
Také jsem zjistil, že když dám mkinitrd initrd list, tak to hlásí: "Could not find map initrd/boot/System.map please specify a correct file with -M. Ale jestli to může mít nějaký vliv netuším, protože samotné mkinitrd proběhne bez chyby. Teda, ale je to věda .... Můžeš mi prosím pastnout Tvůj grub.cfg, abych to mohl porovnat?