Re: [gentoo-user] Re: Suspend to {RAM,Disk]

[Canek Peláez Valdés]

On Fri, May 18, 2012 at 6:36 PM, Canek Peláez Valdés <caneko@×××××.com> wrote:
> On Fri, May 18, 2012 at 5:37 PM, Volker Armin Hemmann
> <volkerarmin@××××××××××.com> wrote:
>> Am Freitag, 18. Mai 2012, 17:26:10 schrieb Canek Peláez Valdés:
>>> On Fri, May 18, 2012 at 5:09 PM, Volker Armin Hemmann
>>>
>>> <volkerarmin@××××××××××.com> wrote:
>>> > Am Freitag, 18. Mai 2012, 22:42:59 schrieb Ignas Anikevicius:
>>> >> On 18/05/12 20:59, Alex Schuster wrote:
>>> >> > Suspend to ram (using the hibernate-ram command from
>>> >> > sys-power/hibernate-script) seems to work better.
>>> >>
>>> >> What about pm-utils? Does it work better or worse than hibernate-script.
>>> >> I had 0 problems with it during entire usage of linux, whereas with the
>>> >> hibernate script package I had some issues...
>>> >>
>>> >> And yes, I am usually suspending to ram, but I was just thinking about
>>> >> possibilities to make my computer boot faster in the cases I really need
>>> >> to do a restart. :)
>>> >>
>>> >> Cheers,
>>> >> Ignas
>>> >
>>> > I just do echo mem > ... or click on the 'Ruhezustand' button in KDE.
>>> > Results in the same. Well working suspend-to-ram. With fglrx. X running
>>> > etc pp.
>>> With upower to suspend-to-ram you can just:
>>>
>>> dbus-send --system --print-reply --dest="org.freedesktop.UPower"
>>> /org/freedesktop/UPower org.freedesktop.UPower.Suspend
>>>
>>
>> which is way harder to type and memorize than:
>> echo mem > /sys/power/state
>
> Yeah. However, he Dbus method works as a simple user; the
> /sys/power/state thing you can only do it as root. At least in my
> system.
>
>>> or use the "Suspend" option in GNOME 3 (GNOME uses upower). That I
>>> already knew. What I didn't knew was that
>>>
>>> dbus-send --system --print-reply --dest="org.freedesktop.UPower"
>>> /org/freedesktop/UPower org.freedesktop.UPower.Hibernate
>>>
>>> works as well for suspend-to-disk. I hadn't hibernated my laptop in
>>> ages, it's good to know it still works. I use systemd+> dracut, which I
>>> suppose it matters for the hibernate option.
>>
>> no, not really...
>
> The restore-from-hibernate requires booting the kernel in a special
> way to load the memory state from the swap partition. That requires
> special handling from the init process and the initramfs; we had a
> discussion some weeks ago about genkernel not handling this correctly.
>
> Maybe systemd has nothing to do with restore-from-hibernate working (I
> don't know)

Oh, and less than two weeks ago systemd added suspend/hibernate targets on git:

http://cgit.freedesktop.org/systemd/systemd/commit/?id=6edd7d0a09171ea5ae8e01b7b1cbcb0bdfbfeb16

Which of course is not necessary for suspend/hibernate to work, but it
is cool nonetheless.

Regards.
-- 
Canek Peláez Valdés
Posgrado en Ciencia e Ingeniería de la Computación
Universidad Nacional Autónoma de México