On Wednesday, February 11, 2015 12:42:12 AM Matthew Garrett wrote: > On Wed, Feb 11, 2015 at 02:02:06AM +0100, Rafael J. Wysocki wrote: > > On Wednesday, February 11, 2015 12:33:18 AM Matthew Garrett wrote: > > > 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. > > Ok. > > > > Is the GPU blocking it because of some configuration difference? > > > > That is possible. > > I know that it has some say in things here. > > > > 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? > > We really need feedback from people who know how the CPU makes its PC6 > determination - the firmware has clearly done something differently, but > without knowing what factors feed into that determination we're pretty > much helpless. We may be able to get that feedback, but what do you suggest we do in the meantime? Nothing, I suppose? -- 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
