Re: Runtime PM discussion notes

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On Saturday, July 30, 2011, Pavel Machek wrote:
> 
> > > > IIRC I solved it by just calling _PTS when sleepy Linux was
> > > > enabled. It had side effect of lighting up moon icon, but otherwise
> > > > seemed to work ok.
> > > > 
> > > > I do not think ACPI says what can and can not be done after _PTS...
> > > 
> > > Yes, it does.
> > 
> > And even if _PTS will work, you're certainly not supposed to execute _WAK
> > with interrupts off.
> 
> It should be ok to execute _WAK in process context once system is
> resumed. ... or maybe not executing _WAK at all. User can probably
> live with moon icon lighted up.

But I don't think the user can live with certain functionality missing,
like battery status or such things.

This is completely unrealistic to think that your prototype can be safely
implemented on _every_ ACPI-based system.  Period.

And that's even without taking SMP into account, BTW.

Thanks,
Rafael
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