On Wednesday, February 11, 2015 12:33:18 AM Matthew Garrett wrote: > On Wed, Feb 11, 2015 at 01:53:26AM +0100, Rafael J. Wysocki wrote: > > On Wednesday, February 11, 2015 12:26:02 AM Matthew Garrett wrote: > > > Hm. It's not clear to me what the bug is describing. If we're not waking > > > up more frequently, why aren't we entering PC6? > > > > Good question. :-) > > > > The bug is saying, pretty much, that after a positive _OSI response to "Darwin" > > we cannot enter PC6 any more on that machine all other things being equal. > > We're using intel_idle, so we should be making idle state determination > regardless of what ACPI tells us. So is Darwin mode influencing the > state of some MSR that controls whether PC6 can be entered? I need to confirm that with Len, but I don't recall there being an MSR controlling the PC6 availability on Haswell. There is one for PC7, but not for PC6 IIRC. > Is the GPU blocking it because of some configuration difference? That is possible. > I don't know enough about how the chip decides to enter PC6 to be able to > tell. Well, so honestly how do you expect me to respond here? -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
