suspend works, but resume doesn't on Dell desktop

Fabian Keil freebsd-listen at
Sat Nov 5 11:17:51 GMT 2005

Mohan Singh <mohansingh68 at> wrote:

> I have a Dell Dimension 4700, dual booting XP and FreeBSD 5.4. Windows
> can hibernate and stand-by fine. I'm trying to do the same (or at
> least standby) from FreeBSD.
> As I understand it Windows standby == FreeBSD suspend (zzz).
> As root, when I run suspend/zzz, it seems to go into standby mode,
> just like it does in Windows. But when I resume (by hitting the power
> button) it just powers on normally, as if the suspend never happened.
> Of course, FreeBSD is not happy about this because the filesystems
> were not dismounted properly and starts fsck'ing.
> How can I get resume to work properly?

On my ThinkPad R51 I put


in /boot/loader.conf and


in /etc/sysctl.conf.

I don't know if it works on your system as well,
but you might want to try it.

Of course it only gets me S3, not S4. 

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