The problem is solved.
Turns out btrfs is disabled by default.

On Sun, Jan 22, 2012 at 5:59 PM, Fajar A. Nugraha [off-list ref] wrote:

On Sun, Jan 22, 2012 at 7:21 PM, Swapnil Pimpale [off-list ref] wrote:

quoted

I can successfully boot into Ubuntu 11.10 (3.0.0-14-generic-pae) with
a btrfs root filesystem and an ext2 /boot partition.
But when I installed the latest vanilla (3.3.0-rc1+) and booted into

where did you get the kernel from? kernel.org snapshot? git? third
party package?

quoted

it, the first time the system froze.
Next time onwards, I get the following error every time:

[   0.427443] [drm:i915_init]  *ERROR* drm/i915 cannot work without
intel_agp module!
mount: mounting udev on /dev failed: No such device
W: devtmpfs not available, falling back to tmpfs for /dev
mount: mounting /dev/disk/by-uuid/f43fdd7a-8ad7-4e96-ab1c-14ba82a4324d
on /root failed: No such device

Do you know how to use your own costom kernel? That error is common
when a driver is missing (i.e. not built-in, and not included in
initrd). The easiest way to test that is to look at what's in
/proc/partitions and /dev/disk/by-id during normal system boot (I
assume you still have the old, working Ubuntu kernel?) and during
failed boot when you're dropped to busybox. If your root device
(sda8?) is not on /proc/partitions, then it's definitely block device
driver problem.

--
Fajar

--Swapnil
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