linux-kernel - Re: [PATCH 2/2] x86: Enable monitor/mwait on Intel if BIOS hasn't already

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Message-ID: <CAObL_7GuAmzyjo5AmYxbTeiAqFtVk1N+opzWEzwJu8Mgrvts7g@mail.gmail.com>
Date:	Wed, 3 Aug 2011 12:22:04 -0400
From:	Andrew Lutomirski <luto@....edu>
To:	Len Brown <lenb@...nel.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Fenghua Yu <fenghua.yu@...el.com>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/2] x86: Enable monitor/mwait on Intel if BIOS hasn't already

On Wed, Aug 3, 2011 at 12:15 PM, Len Brown <lenb@...nel.org> wrote:
> On Wed, 3 Aug 2011, Andy Lutomirski wrote:
>
>> I have a Sandy Bridge machine with an Intel BIOS that enables
>> monitor/mwait on all but the boot CPU.  With this patch, intel_idle
>> works.
>
> What machine has this BIOS bug, and are you running
> the latest version of the BIOS?

Intel DQ67SW, version SWQ6710H.86A.0051.2011.0413.1154.  This is not
quite up-to-date -- I'll test a newer BIOS.

(Enabling monitor/mwait on some but not all CPUs is obnoxious, too.  I
think it's just dumb luck that Linux notices at all and doesn't
crash.)

--Andy
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