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. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- 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
