On Thu, Jun 20, 2002 at 05:18:25PM -0700, Grover, Andrew wrote:
> > From: Michael Nottebrock [mailto:[EMAIL PROTECTED]]
> > > You are right. My PC supports this via BIOS too. The
> > > disadvantage is, that the bios handle it. I like W2K's
> > > feature to do it ACPI based (?). This gives my the freedom
> > > to suspend my W2K to disk and to reboot with FBSD. Later I
> > > reboot again and choose W2K and it restores it previous
> > > state. If the bios does it, it restores always the last
> > > suspended OS.
> > AFAIR, the Win2k-Suspend2Disk is not ACPI-based.
> Win2k suspend to disk (STD) (aka hibernate aka ACPI S4) is using ACPI. ACPI
> defines 2 kinds of STD, S4 and S4BIOS. S4 is completely done by the
> operating system, and then uses the ACPI interface to turn the system off.
> S4BIOS...uses the BIOS, usually to a dedicated suspend partition.
> Having the OS save the system image to disk is generally considered the way
> to go. But of course that requires that your OS have that added capability.
> So yes I guess you *are* right in that ACPI doesn't actually do the suspend
> to disk, but it is involved in the process.
there is a little detail that I don't understand actually. When we
want to enter S4 in:
we have to fill PM1AControl and PM1BControl with some values deduced by
the DSDT. Those values are different, and I am ok with that for S1, S2, etc.
But for S4 and S5, there are different too. If I am correct, this implied
a different glue logic for the hardware. What is the difference expected
for S4 and S5?
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