linux-kernel - Re: [kernel 3.13.0-06058-g2d08cd0] Strange ACPI error messages

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Message-ID: <1691151.Vu0Ye8lgsC@vostro.rjw.lan>
Date:	Sat, 25 Jan 2014 23:29:04 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Jörg Otte <jrg.otte@...il.com>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [kernel 3.13.0-06058-g2d08cd0] Strange ACPI error messages

On Saturday, January 25, 2014 05:32:19 PM Jörg Otte wrote:
> 2014-01-25 Rafael J. Wysocki <rjw@...ysocki.net>:
> > On Saturday, January 25, 2014 11:03:09 AM Jörg Otte wrote:
> >> Kernel 3.13.0-06058-g2d08cd0 displays following errors on the console:
> >>
> >> ACPI: \_PR_.CPU4: failed to get CPU APIC ID.
> >> ACPI: \_PR_.CPU5: failed to get CPU APIC ID.
> >> ACPI: \_PR_.CPU6: failed to get CPU APIC ID.
> >> ACPI: \_PR_.CPU7: failed to get CPU APIC ID.
> >>
> >> I don't have CPUs 4..7! Error messages regarding not existing
> >> CPUs should not be displayed.
> >> kernel 3.13.0-05617-g3aacd62 and before did'nt show this messages.
> >>
> >> This is a regression. I never saw this messages before.
> >
> > Does your system show any other suspicious symptoms or are you worried about
> > those messages only?
> >
> > Rafael
> >
> 
> what's looking badly is this:
> 
> ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S1_]
> (20131218/hwxface-580)
> ACPI Exception: AE_NOT_FOUND, While evaluating Sleep State [\_S2_]
> (20131218/hwxface-580)

That means your BIOS doesn't support system sleep states S1 and S2, but we
should be able to suppress those messages I think.

> and this:
> 
> acpi PNP0A08:00: _OSC: OS supports [ASPM ClockPM Segments MSI]
>  \_SB_.PCI0:_OSC invalid UUID
>  _OSC request data:1 1e 0
> acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM

That means the BIOS doesn't want to grant the kernel control of extended
PCIe features on your system.

> but these messages are not new.

They indicate things that are not supported by the BIOS, but I agree that the
messages are a bit cryptic.

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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