Bizarr shutdown hang behavior

[roland]

Hello all. I have a question on hangs on shutdown. I am running a 
2.6.31.5 kernel. The machine is running an athlon64 processor and the
motherboard is a MSI K8N Neo V2.0 H nForce3 250. Machine works great 
other than hanging on shutdown. Looks like the hang is in
umounting the filesystems in preparation  for powering off. Almost looks 
like the hard drives are powered down too soon. This happens
only after a long time running. Earlier kernels ( 2.6.25 ) don't do 
this. System has 2 pata drives on the on board nvidia IDE ports and one
on a silicon image ATA controller. Reason for my confusion is that this 
in new behavior  after  going to  the  2.6.3[0-1] kernel's .
any help  GREATLY appreciated.
Thanks.

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