On Sat, 31 Jan 2009, Linus Torvalds wrote:

I thought the _DSW thing is common for setting up wakeup, but _PSx is not. 
But I have not looked at many ACPI tables in my life. I try to active 
avoid it if I at all humanly can.

Doing a quick grep on my laptop seems to confirm that. No actual _PSx 
things found in any acpi tables at all that I can see.

And on a mac mini, there are _PS3 entries that _look_ like they are 
connected to the IDE controller and the realtime clock, but it looks like 
they don't happen for the PCI devices.

But again - I may have screwed that up. ACPI tables are not my favourite 
data structure.

		Linus