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  From: Avery Pennarun <apenwarr@worldvisions.ca>
  To  : Richards, David <David.Richards@ccc.govt.nz>
        <apmd-list@worldvisions.ca>
  Date: Sun, 24 Jan 1999 23:06:16 -0500

Re: Hibernation

On Mon, Jan 25, 1999 at 04:51:05PM +1300, Richards, David wrote:

> Windows 98 & Windows NT power management that allows shutdown, suspend &
> hibernate.
>
> shutdown  - shuts down & powers off - I have this working with Linux...
>
> suspend   - put processor to a low power state, and all processing stops,
> battery still used. (works with Linux)
>
> hibernate - pauses, saves all memory to a hibernation file, and powers off,
> when you turn on the machine, it continues from the "pause". (Haven't found
> any info on this for Linux yet)

Okay, my laptop (a two-year-old AST Ascentia) does that, but it does it
automatically after you've been suspended for a certain amount of time
(configurable in the BIOS).  This works in Linux as well as Windows.

I don't think the APM BIOS specification specifically talks about hibernate
mode, though I could be wrong.  Anyway, Linux doesn't know a way to directly
tell the system to hibernate.  If you can't make your laptop do it by
itself, it's not currently supported.  (But if you can find documentation on
how to do it, one of the kernel hackers on this list might want to help you
get it implemented...)

Good luck.

Avery