[ltp] Battery discharge during hibernation

[Anton Katsarov]

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=D0=92 16:27 +0100 =D0=BD=D0=B0 10.03.2009 (=D0=B2=D1=82), Thomas Kahle =D0=
=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0:
> Anton Katsarov wrote:
> > Hi, all,
> >=20
> > I have a ThinkPad T400 and I am using pm-hibernate with the script for
> > stopping one of the CPU cores.
> >=20
> > Last night I hibernated my computer and the batter was 82% charged. I
> > plugged out the AC. Today when I turned it on again it was 75% charged.
> > And that is not the first time I face this issue.
> >=20
> > Is it possible during hibernation the battery to be discharged? Does
> > anyone have the same issue?
>=20
> Hi,
>=20
> I had the same problem and people started to call me a crazy paranoid...
> But it was not related to Wake on LAN. On my X61s
>=20
> echo =E2=80=9Cshutdown=E2=80=9D > /sys/power/disk
>=20
> solved the problem. You have to repeat this step after every reboot (or
> was it after every sleep even.) So you should place a hook in your
> hibernate tools and boot process.
>=20
> Somehow, if this is set to 'platform' I think the RAM will stay on to
> make a hybrid sleep mode known from Apple's laptops. The computer does
> suspend to RAM and Disk at the same time to come up very fast, but not
> crash if running out of battery during sleep.
>=20
> hope to help
> Tom

That sound reasonable to me. I'll test it tonight.

Thanks a lot.


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