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Old 02-17-2012, 07:42 PM
Ben Hutchings
 
Default Bug#660265: please include patch to select rc6 modes via kernel parameter

On Fri, Feb 17, 2012 at 09:24:54PM +0100, Michael Meskes wrote:
> Package: linux-2.6
> Version: 3.2.6-1
> Severity: wishlist
>
> Eugeni Dodonov from Intel proposed a patch to make rc6 modes selectable via
> kernel parameter. With these patch it is possible to enable rc6 but not deep or
> deepest rc6, a setting that makes ultrabooks, well at least the ASUS Zenbook,
> work very reliable but still get good battery time.
>
> It would be nice of this patch could be added to the Debian kernel.
[...]

What is the upstream status of this?

Why is it important for the user to be able to configure this, i.e.
why can't the kernel just DTRT? Why can't it be changed at run-time
like CPU power-saving?

Does this result in a safe default if no kernel parameter is
specified?

Ben.

--
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
- Albert Camus



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Old 02-17-2012, 09:21 PM
Michael Meskes
 
Default Bug#660265: please include patch to select rc6 modes via kernel parameter

On Fri, Feb 17, 2012 at 08:42:43PM +0000, Ben Hutchings wrote:
> What is the upstream status of this?

AFAIK included in 3.4.

> Why is it important for the user to be able to configure this, i.e.
> why can't the kernel just DTRT? Why can't it be changed at run-time
> like CPU power-saving?

It is already configurable in 3.2, but you can only switch it on. This include
RC6 but also deep RC6 which makes (some) system stop quite frequently. That's
why the default is to switch it off completely. However, that gives a much
higher battery drain.

> Does this result in a safe default if no kernel parameter is
> specified?

Yes, the same as in 3.2.

Michael
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Old 02-18-2012, 06:46 AM
Jonathan Nieder
 
Default Bug#660265: please include patch to select rc6 modes via kernel parameter

Ben Hutchings wrote:
> On Fri, Feb 17, 2012 at 09:24:54PM +0100, Michael Meskes wrote:

>> With these patch it is possible to enable rc6 but not deep or
>> deepest rc6, a setting that makes ultrabooks, well at least the ASUS Zenbook,
>> work very reliable but still get good battery time.
[...]
> What is the upstream status of this?

Under discussion[1]. Not in drm-intel-next yet[2].

I suspect a different, more targetted patch[3] would do a better job
of addressing the described use case:

1c8ecf80fdee4e "drm/i915: do not enable RC6p on Sandy Bridge", 2012-02-14

It can be found in the drm-intel-fixes tree[4].

Hope that helps,
Jonathan

[1] http://thread.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/8722
[2] git://people.freedesktop.org/~danvet/drm-intel
[3] http://thread.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/8779
[4] git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/drm-intel.git



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Old 02-18-2012, 12:38 PM
Michael Meskes
 
Default Bug#660265: please include patch to select rc6 modes via kernel parameter

On Sat, Feb 18, 2012 at 01:46:15AM -0600, Jonathan Nieder wrote:
> Under discussion[1]. Not in drm-intel-next yet[2].

Sorry, I should have double checked my information.

> I suspect a different, more targetted patch[3] would do a better job
> of addressing the described use case:

I'm currently testing this. And yes, this one seems to solve the problem I was
trying to get addressed.

Michael

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