If you have a single / filesystem on lvm2, the boot process will hang waiting for a root filesystem that never appears. This patch modifies the logic in deciding what the root device actually is, and allows the initramfs to succesfully load the root filesystem.
The attached patch has been in use in the debian "grub2" packages for quite a while, so I assume it's safe to use :)
Index: b/util/grub.d/10_linux.in
===================================================================
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -43,7 +43,8 @@
esac
if [ "x${GRUB_DEVICE_UUID}" = "x" ] || [ "x${GRUB_DISABLE_LINUX_UUID}" = "xtrue" ] \
- || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" ; then
+ || ! test -e "/dev/disk/by-uuid/${GRUB_DEVICE_UUID}" \
+ || [ "`grub-probe -t abstraction --device ${GRUB_DEVICE} | sed -e 's,.*\(lvm\).*,\1,'`" = "lvm" ] ; then
LINUX_ROOT_DEVICE=${GRUB_DEVICE}
else
LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
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