linux-kernel - Re: [PATCH] ACPI: make acpi

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Date:	Thu, 22 Jul 2010 11:57:53 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	"Yu, Luming" <luming.yu@...el.com>,
	Philip Langdale <philipl@...rt.org>,
	Jeff Garrett <jeff@...rrett.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"venki@...gle.com" <venki@...gle.com>
Subject: Re: [PATCH] ACPI: make acpi_idle Nehalem-aware

This patch is kaput.

As detailed in the bug report
https://bugzilla.kernel.org/show_bug.cgi?id=15886
we should be able to fix some of these boxes
by paying attention to an ACPI flag we didn't
realize  existed until yesterday.

I'll follow-up with a new patch today.

However, we'll still have issues with systems
like the HP DL360 G6 which explicity set the
flag to ask for BM_STS checking and configure
the chipset such that BM_STS is active.
That may require a BIOS fix, or we may
have to run intel_idle on that box --
since intel_idle ignores BM_STS always
and instead relies on drivers to use pm_qos
to register device latency constraints.

thanks,
Len Brown, Intel Open Source Technology Center

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