Bug 69345

Summary:	nouveau no longer reports D3cold on linux-next as of at least 20130906
Product:	Mesa	Reporter:	Tod Jackson <tod.jackson>
Component:	Drivers/DRI/nouveau	Assignee:	Nouveau Project <nouveau>
Status:	RESOLVED NOTABUG	QA Contact:
Severity:	minor
Priority:	medium	CC:	peter
Version:	git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	current dmesg

Description Tod Jackson 2013-09-14 06:38:57 UTC

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.

Comment 1 Tod Jackson 2013-09-14 06:56:10 UTC

Created attachment 85810 [details]
current dmesg

Comment 2 Peter Wu 2013-09-16 10:41:08 UTC

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?

Comment 3 Tod Jackson 2013-09-16 15:54:41 UTC

It's quite possibly a non-issue. But it's new behavior, so I just wanted to check it was intentional.

Comment 4 Ilia Mirkin 2013-10-11 00:57:47 UTC

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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