Comment 3 for bug 420900

The same issue happens to me with the detection of CentOS.

The grub.cfg reads:
menuentry "CentOS release 5.3 (Final) (on /dev/sda6)" {
 insmod ext2
 set root=(hd0,6)
 search --no-floppy --fs-uuid --set 4870fcd7-5b5b-4276-97ee-a8134dd68e2a
 linux /boot/vmlinuz-2.6.18-128.7.1.el5 root=/dev/sda6
}

While it should contain the following:
menuentry "CentOS release 5.3 (Final) (on /dev/sda6)" {
 insmod ext2
 set root=(hd0,6)
 search --no-floppy --fs-uuid --set 4870fcd7-5b5b-4276-97ee-a8134dd68e2a
 linux /boot/vmlinuz-2.6.18-128.7.1.el5 root=/dev/hda6
 initrd /boot/initrd-2.6.18-128.7.1.el5.img
}

Additionally (although I am not sure if I should issue a separate bug for this) I have to alter (as shown above) root=/dev/sda6 into root=/dev/hda6 in order for CentOS to boot.