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    SubjectRe: [RFC PATCH v2 1/3] PM / Core: suspend_again callback for device PM.
    On Tue, Apr 26, 2011 at 10:38:53PM +0200, Pavel Machek wrote:
    > Hi!
    >
    > > > To conclude, I'm not sure about the approach. In particular, I'm not sure
    > > > if the benefit is worth the effort and the resulting complications (ie. the
    > > > possibility of having to deal with wakeup signals not requested by user
    > > > space) seem to be a bit too far reaching.
    > > >
    > > > Greg, what do you think?
    > >
    > > I agree with you in that I don't think that this type of feature is
    > > valid at the moment.
    >
    > Our current "solution" is low level suspend code on Zaurus directly
    > looking at charger state and doing the "wakeup or not" decision by hand.
    >
    > > I don't understand why our current situation doesn't work, what are we
    > > lacking that is needed for these systems that we have not seen
    > > before?
    >
    > It works, but it is ugly; and it seems samsung now needs similar
    > hacks.
    >
    > > What is the root problem that this is trying to solve?
    >
    > It is trying to fix machines that need to run periodic kernel tasks
    > even when user asked them to sleep. Zaurus needs to periodicaly wake
    > up to be able to charge battery in s2ram state, for example.

    That sounds like a bug in userspace you are trying to work around. Why
    not solve it there first?

    thanks,

    greg k-h


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