Poweroff works intermittently

[Nico <nsabbi-IWqWACnzNjyonA0d6jMUrA@public.gmane.org>]

Hi,
I'm having a strange problem with vanilla kernels 2.6.[124] on my Abit 
IC7 motherboard:
halt doesn't always shut down the system, instead it hangs after having 
written "entering sleep state s5"
on the console.
Acpi is enabled and recognized at boot.
There isn't a repeatable pattern for the poweroff failure: sometimes it 
works after a cold boot, sometimes
after windows resets the pc,  sometimes it doesn't work for days;
I also added the most recent patches to the kernel, but without 
improvements.

For the record: windows  always shuts down the pc properly, and I never 
installed any additional driver.

What can I do?
Thanks,
       Nico





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