Re: [ACPI-sppt] Suspend key?

From: "Matej Cepl" <[email protected]>
>
> I have installed ACPI patch (acpi-20030916-2.4.22.diff) over fresh
> 2.4.22 kernel from kernel.org. To my biggest surprise it works (at least
> contrary to clean kernel with APM, poweroff really switches off computer
> and with swsusp echo 4 > /proc/acpi/sleep leads to Hibernation).
> However, I have still two questions:
>
> 1) I can do Suspend-To-Disk with swsusp (GREAT!), but I am not sure
>    about Suspend-To-RAM. Can I do it? cat /proc/acpi/sleep gives me
>    'S0 S1 S4 (Bios) S5 '. Is there anywhere description, what these
>    states mean?

No.  You can't do suspend-to-RAM for two reasons.  First, you need a 2.5/2.6
kernel as it's never been implemented in 2.4;second, your BIOS doesn't
support it (S3 - though I'm not sure if it will _need_ to support S3 in 2.5
kernels).  S4(Bios) means that it should be possible to do a quicker
suspend-to-disk than the swsusp version, because your BIOS has it's own
code.  However, if you have swsusp working, I wouldn't mess with S4Bios.




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