[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 #7 from Peter Wu <peter at lekensteyn.nl> ---
(In reply to Benny Ammitzbøll from comment #6)
[..]
> 00:01.0 PCI bridge [0604]: Intel Corporation Skylake PCIe Controller (x16)
> [8086:1901] (rev 07)
[..]
> 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM204M [GeForce
> GTX 970M] [10de:13d8] (rev a1)
[..]
> In the "Tunables" tab? They're all "Bad" when on AC (until I change them to
> Good):
[..]
> >> Bad           Runtime PM for PCI Device NVIDIA Corporation GM204M [GeForce GTX 970M]                                 
[..]
>    Bad           Runtime PM for PCI Device Intel Corporation Skylake PCIe
> Controller (x16)

There is your problem. You have something that modifies runtime PM settings. In
the default configuration, runtime PM would be enabled for both. Try
removing/disabling that problematic tool.

> Ok, but you say that I can't use the second (preferred) option when I load
> the nouveau driver - so I must use pcie_port_pm=off. Shouldn't the nouveau
> driver be updated to support the second option in stead?

nouveau has been updated at the same time to support the new, preferred option.
But if you use pcie_port_pm=off, it will fallback to the old method.

> > Upgrade to kernel 4.10 or newer, then your brightness keys should work
> > without forcing acpi_osi=Linux. See
> > https://bugzilla.kernel.org/show_bug.cgi?id=123651
> 
> Not so, I am already on kernel 4.9.34:

4.9 is too old, use 4.10 (TEN) or newer.

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