suspend to disk

Andriy Gapon avg at
Tue Feb 9 12:33:23 UTC 2010

on 09/02/2010 01:13 Christof Schulze said the following:
> Hello everyone
> today I tried whether my samsung q35 laptop would suspend using acpiconf on 
> RELENG_8. I was amazed that acpiconf -s3 works out of the box. However 
> acpiconf -s4 does not work which would be the useful side of hibernation for 
> me.
> From the manpage of acpiconf I understand that acpiconf -s4 should store the 
> non-cache-parts from ram somewhere on disk. If called the system shuts down 
> without writing much on the disk so something is odd there.
> I have 2,5 gb of ram and only 800MB of swap space which is labeled correctly.
> What do I have to do in order to make suspend to disk work?
> Is it possible to compress the contents of the ram like some programs from the 
> linuxworld do it (tuxonice)?
> Or did I entirely miss some configuration here? 
> Please cc me while replying to this email as I am not on the freebsd-acpi 
> list. I do track -stable though.

Long story short - FreeBSD does not support 'pure' S4.
S4BIOS might work if your BIOS provides that feature.

Andriy Gapon

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