I have a couple of platforms (including the n450 dev board from kernel
summit) where an x86 32b build of 3.0.4-rt14 fails to shutdown with
"shutdown -h now". reboot works properly, and shutdown works with
maxcpus=1 (otherwise the n450 has 2 hardware threads).

The last messages to hit the console are:

e1000e 0000:04:00.0: PCI INT A disabled
ehci_hcd 0000:00:1d.7: PCI INT A disabled
ehci_hcd 0000:00:1a.7: PCI INT C disabled

I am booting from a USB stick. If I install to a SATA connected SSD, the
shutdown still fails, but I don't see the "INT X disabled" messages.

Has anyone run into this with a known workaround? Any thoughts on where
to start digging?

.config attached.
-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel