Upgrade from 11.0 to 11.1 kernel problems

Hi

Since i upgraded to 11.1 (around beta2) i have some problems with initrd, grub and fstab.

On my fstab i list my disks partitions as /dev/dm-x
grub and initrd uses /dev/mapper/sil_agaecedfccfb_part1

but when i boot kernel it falls back to /dev/disk/by-id/ata-Maxtor_6V250F0_V596HXEG-part1

and the funny part is df -h shows
Filesystem Size Used Avail Use% Mounted on
/dev/dm-1 97G 74G 18G 81% /

This make my latest factory kernel unbootable. How can i fix this ?