Subject: Re: ACPI S4BIOS support
To: Brian Buhrow <email@example.com>
From: Joerg Sonnenberger <joerg@NetBSD.org>
Date: 11/13/2007 15:42:46
On Mon, Nov 12, 2007 at 11:17:16PM -0800, Brian Buhrow wrote:
> For my part, I'd like to see slee to disk supported at some point, so
> ripping out what support alreadypotentially exists seems counter productive
> from my perspective.
S4BIOS and S4 are completely different beasts. The former is requiring
the BIOS to essentially write the system state to disk, power the system
down and load everything again from disk. This is not implemented in
almost all newer machines, just like APM is not implemented.
This logically brings us to the question if any hardware supports it and
if someone is using it. Otherwise it is just dead weight and stiffles
improving the code.
Note that ACPI S3 is not that bad for battery usage (less than 1%/h here)
and it will always be much faster as it needs to write a lot less data.