Rafael J. Wysocki wrote:

On Wednesday, 26 of December 2007, Linus Torvalds wrote:
  

quoted

On Tue, 25 Dec 2007, Rafael J. Wysocki wrote:
    

quoted

the ACPI specification between versions 1.0x and 2.0.  Namely, while ACPI
2.0 and later wants us to put devices into low power states before calling
_PTS, ACPI 1.0x wants us to do that after calling _PTS.  Since we're following
the 2.0 and later specifications right now, we're not doing the right thing for
the (strictly) ACPI 1.0x-compliant systems.

We ought to be able to fix things on the high level, by calling _PTS earlier on
systems that claim to be ACPI 1.0x-compliant.  That will require us to modify
the generic susped code quite a bit and will need to be tested for some time.
      

That's insane. Are you really saying that ACPI wants totally different 
orderings for different versions of the spec?
    

Yes, I am.

  

quoted

And does Windows really do that?
    

I don't know.
  

Windows was compliant only with 1.x spec until Vista.
With Vista claims are 3.x compliance.