[systemd-devel] Linux 3.6 hybrid-sleep

[Lennart Poettering]

On Mon, 15.10.12 11:40, Federico Di Pierro (nierro92 at gmail.com) wrote:

> Hi!
> I'm using systemd 194 in archlinux. I read that linux 3.6 comes with
> hybrid-sleep, finally.
> I only rely on systemd to suspend/hibernate (well i use it together with
> tuxonice to hibernate, but i don't think this can be a problem). So I was
> wondering: will i be able to hybrid-sleep with systemd only systemd? Or
> hybrid sleep is still a pm-utils only feature?

systemd currently has no native support for hybrid suspend+hibernate. It
should be easy to add this though, but I am not entirely sure how to do
this best:

a) it could be a special option of normal suspend, that is enabled
globally. "systemctl suspend" would then result in this hybrid
suspend+hibernate state to be entered.

b) or it could be a special option of normal hibernation, that is
enabled globally. "systemctl hibernate" would then result in this hybrid
suspend+hibernate state to be entered.

c) or it could be an entirely new operation, so that "systemctl hybrid"
or so would be the way to enter this state.

The low-level kernel implementation implemented this as b).

Implementing it as a) is probably a bad idea, since the hybrid
suspend+hibernate scheme is much slower than suspend. Newer MacOS
however always goes into hybrid suspend+hibernate where we go into
suspend-only.

I am tempted to say that we should expose this as c) instead. But that
requires us to think how we should actually call this. "systemctl
hybrid", "systemctl both", "systemctl suspend+hibernate"? All names I
could come up with suck badly, for a variety of reasons.

Dunno, opinions?

Lennart

-- 
Lennart Poettering - Red Hat, Inc.