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SubjectRe: [PATCH] cpuidle: fix new C-states not functional after AC disconnect
Date
On Sunday, January 13, 2013 03:41:34 PM Daniel Lezcano wrote:
> On 01/13/2013 01:34 PM, Thomas Schlichter wrote:
> > Hi,
> >
> > there is a long-standing regression about new C-states not working after
> > disconnecting AC power from a laptop if the cpuidle driver "acpi-idle" is
> > used. It was reported here:
> >
> > [1] https://bugzilla.kernel.org/show_bug.cgi?id=42870 (March 5th 2012)
> > [2] https://bugzilla.kernel.org/show_bug.cgi?id=43349 (June 7th 2012)
> > [3] https://lkml.org/lkml/2012/10/16/518 (October 19th 2012)
> >
> > In [1] Andreas proposed a patch that initialized the missing power_usage
> > values from within acpi_idle in the same way as cpuidle does.
> > In [2] I proposed a patch to use the power values provided by ACPI to
> > initialize the power_usage variables.
> > In [3] Julius proposed a patch to call the initialization function
> > set_power_states() not only once, but always when the C-states change.
> >
> > Currently, Daniel Lezcano seems to be working on an intrusive change of not
> > using the power_usage value at all for choosing a C-state:
> >
> > [4] https://lkml.org/lkml/2012/12/14/155
> >
> > As I could not find any of these patches in any git trees to be merged for
> > 3.8, I propose an other, least intrusive patch for the time being. It is
> > attached an initializes _all_ power_usage values in the first place.
> >
> > As this is a real power consumption regression since 3.2, I really ask you to
> > apply anything and push it to stable, too!
>
> Rafael, is possible to apply the patch [1/2] I previously sent ?
>
> https://patchwork.kernel.org/patch/1878691/

I need to talk about this with Len. That should happen tomorrow if everything
goes well.

> So we get this bug fixed.
>
> I will resend the patch [2/2] as soon as possible.

OK

Thanks,
Rafael


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


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