Nouveau - Sep 2013 - [Bug 69345] New: nouveau no longer reports D3cold on linux-next as of at least 20130906

https://bugs.freedesktop.org/show_bug.cgi?id=69345

          Priority: medium
            Bug ID: 69345
          Assignee: nouveau at lists.freedesktop.org
           Summary: nouveau no longer reports D3cold on linux-next as of
                    at least 20130906
          Severity: minor
    Classification: Unclassified
                OS: Linux (All)
          Reporter: tod.jackson at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/DRI/nouveau
           Product: Mesa

Hi there,

I saw Rafael made this recent commit:
http://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=8ad928d52e63a9b7d69f0873d7318c4561e2f8cd

That may not be the culprit at all, sorry. I noticed that if I'm using, say,
the latest drm-intel-next kernel or nouveau kernel ACPI reports nouveau's
status properly, e.g. nouveau: power state changed by ACPI to D3cold, however
in next I no longer get these messages, although the device seems to be in
D3cold (?). At least temperatures are much lower, especially when building
software.

[23301.994315] ACPI Warning: \_SB_.PCI0.P0P2.PEGP._DSM: Argument #4 type
mismatch - Found [Buffer], ACPI requires [Package] (20130725/nsarguments-95)
(That's the only indicator of power transitions now - a warning that might
go
away in the future - p.s., do I need to do some DSDT hacking for that or is it
on the Linux-side?)

Invoking lm_sensors' sensors command shows N/A for the nouveau device on
Optimus laptops, as expected if the device is in D3cold.

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https://bugs.freedesktop.org/show_bug.cgi?id=69345

--- Comment #1 from tod.jackson at gmail.com ---
Created attachment 85810
  --> https://bugs.freedesktop.org/attachment.cgi?id=85810&action=edit
current dmesg

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https://bugs.freedesktop.org/show_bug.cgi?id=69345

Peter Wu <lekensteyn at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lekensteyn at gmail.com

--- Comment #2 from Peter Wu <lekensteyn at gmail.com> ---
That DSM argument mismatch warning is caused by the modules (nouveau and
bbswitch) and is a workaround for buggy DSDTs. It is possible to make the
warning go away, but that will confuse machines with buggy DSDTs.

I haven't looked in the code yet, but what is the issue with D3cold not
being
mentioned in dmesg?

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--- Comment #3 from tod.jackson at gmail.com ---
It's quite possibly a non-issue. But it's new behavior, so I just wanted
to
check it was intentional.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I believe this is part of the runtime pm support that was added for Optimus
setups in 3.12-rc1, which puts the nvidia card into d3cold when it's not
being
used. You can disable it by adding nouveau.runpm=1. If there are any actual
issues with it, feel free to open issues about it. I think that ACPI warning is
about buggy AML, perhaps a BIOS update will fix it, or more likely, you'll
have
to live with it.

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