[Nouveau] [Bug 101404] GTX 970M (GM204-A) not powered off when not in use (DynPwr in stead of DynOff)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101404

--- Comment #4 from Benny Ammitzbøll <benny at ammitzboell-consult.dk> ---
(In reply to Peter Wu from comment #3)
> When the nouveau driver is loaded, runtime PM for the Nvidia PCI device
> (01:00.0 in your case) should be enabled.

Yes, I agree. Why is the Nvidia card not going to DynOff when on AC and not
being used then? I can force it by using powertop, but why does this not happen
automatically?

> Without pcie_port_pm=off this will
> also enable runtime PM for the parent device, a PCIe port.

Ok, but then I don't understand why without pcie_port_pm=off I get a higher
power consumption? I mean, the parent device should power down the entire PCIe
port incl. the Nvidia card? And before linux kernel 4.8 (I think)
pcie_port_pm=off was not needed, so what happened?

> Any reason why you boot with acpi_osi=! acpi_osi=Linux? If you want to
> prevent a lockup that occurs with Clevo P6xxRx models, try
> acpi_osi="!Windows 2015"
> (see https://bugzilla.kernel.org/show_bug.cgi?id=156341)

Because while acpi_osi="!Windows 2015" does prevent the lockup, I still have
some Fn keys that are not working (notably those that adjust screen brightness,
but others as well). With acpi_osi=! acpi_osi=Linux all of my Fn keys are
working, incl. no lockup.

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