Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH] ACPI: evaluate _PS3 when entering D3 Cold | Date | Sun, 1 Apr 2012 09:29:20 +0200 |
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On Sunday, April 01, 2012, Zhang Rui wrote: [...] > > How about this? > > We should use the term "D3" in general in Linux.
I don't see why. We can refer to the "old D3" as D3_cold.
> Without _PR3, OS should *assume* that the power is removed, although it > may be not true.
That's correct.
> With _PR3, OS can *assure* that the power is removed, because it knows > how to remove thw power (evaluating _PR3._OFF).
I'd rather say that with _PR3 we have the opportunity to avoid removing power completely from the device. In other words, D3_hot is supported (and it is supported _only_ in that case).
> So the difference is that OS need to make sure whether to evaluate > _PR3._OFF when _PR3 exists. For example, a device has _PR3, but _S0W > returns 3, OS should not evaluate _PR3._OFF when the device sleeps with > remote wakeup support.
That's correct.
> what do you think?
Well, see above and my other message in this thread.
Thanks, Rafael
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