linux-kernel - Re: [PATCH] PCI / ACPI: Do not request control of ASPM if the BIOS has disabled it

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Message-ID: <1337946813.3990.49.camel@amber.site>
Date:	Fri, 25 May 2012 13:53:33 +0200
From:	Jean Delvare <jdelvare@...e.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	ACPI Devel Mailing List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	Len Brown <lenb@...nel.org>, Wei Kong <wkong@...ell.com>
Subject: Re: [PATCH] PCI / ACPI: Do not request control of ASPM if the BIOS
 has disabled it

Hi Matthew,

Le jeudi 24 mai 2012 à 21:45 +0100, Matthew Garrett a écrit :
> On Thu, May 24, 2012 at 10:45:45PM +0200, Rafael J. Wysocki wrote:
> 
> > However, knowing that the BIOS doesn't support ASPM, we shouldn't
> > request the control of it, so we should remove
> > (OSC_ACTIVE_STATE_PWR_SUPPORT | OSC_CLOCK_PWR_CAPABILITY_SUPPORT)
> > from the flags before calling acpi_pci_osc_control_set() in those
> > cases.  Failing to do so causes the evaluation of _OSC for the PCI
> > root bridge to return error codes on some systems where it should
> > work correctly.
> 
> Is there an example of an affected machine's DSDT?

Attached.

Jean


Download attachment "DSDT.dat" of type "application/octet-stream" (44403 bytes)