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

[Andrew Lutomirski]

On Wed, Aug 3, 2011 at 12:22 PM, Andrew Lutomirski <luto@xxxxxxx> wrote:
> On Wed, Aug 3, 2011 at 12:15 PM, Len Brown <lenb@xxxxxxxxxx> 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.

SWQ6710H.86A.0053.2011.0615.1535 has the same problem.  It fixed ASPM, though :)

Should I redo the patch with a printk to warn about the firmware bug?

--Andy

>
> (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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