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From: Warner Losh <imp@harmony.village.org>
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Subject: Re: [PATCH] Please test: new ACPI release (20041105) import
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> My serial port.  It's named UART in the AML, that's all.  Setting it to 
> D3 hangs the system.

Is it a PCI device too?  If not, then maybe you need to disable
interrupts in the UART before setting the power state.  Chances are
its interrupt cause register is returning 0xff, which hangs sio, since
it never breaks out of the loop when this happens.

Warner