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From: Eric Rannaud <eric.rannaud@gmail.com>
To: Sean V Kelley <sean.v.kelley@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	"intel-gfx@lists.freedesktop.org"
	<intel-gfx@lists.freedesktop.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jon Kristensen <info@jonkri.com>
Subject: Re: i915: Regression: +4W in idle power use on Macbook Pro 15 (late 2013)
Date: Thu, 28 Aug 2014 10:19:05 -0700	[thread overview]
Message-ID: <CA+zRj8UDzV7DgeLOyLdQOA8OhyXbUntPBq=97otDf7GOKUMbQQ@mail.gmail.com> (raw)
In-Reply-To: <CA+qSnqj9Cr8-Wh_Pb=uREL4wkoa9e4X7TL_9+Oz4LEzT3nTE1Q@mail.gmail.com>

On Thu, Aug 28, 2014 at 9:41 AM, Sean V Kelley <sean.v.kelley@intel.com> wrote:
> For what it's worth, I have a Mid-2014, Macbook Pro Retina (13inch display),
> running Archlinux with 3.16.
>
> Definitely, enable_fbc is a win for me and I do manually enable it.  But I
> am still seeing what I believe to be
> a regression overall of about +4W even with fbc enabled.  Still digging for
> clues.

To be clear, because I don't think I listed that case, with
3.17.0-rc2-ARCH-00040-gff0c57ac7043 and i915.enable_fbc=1 the idle
power consumption goes back down to under 7W, which is about back to
normal.

There does seem to be a roughly +500mW regression since 3.13, but it's
a little hard to tell because of the sampling noise in the power
information as reported by powertop.

Is there a systematic, large-scale effort to obtain baseline power
data over time on various configs?

      reply	other threads:[~2014-08-28 17:19 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-22 17:40 i915: Regression: +4W in idle power use on Macbook Pro 15 (late 2013) Eric Rannaud
2014-08-25 10:19 ` Jani Nikula
2014-08-25 10:22   ` Jani Nikula
2014-08-25 12:19     ` Eric Rannaud
2014-08-26 11:06       ` Ville Syrjälä
2014-08-26 13:38         ` Eric Rannaud
2014-08-26 14:57           ` Eric Rannaud
2014-08-26 20:59             ` Daniel Vetter
2014-08-26 23:00               ` Eric Rannaud
2014-08-27  9:17                 ` Ville Syrjälä
2014-08-27 17:50                   ` Eric Rannaud
2014-08-28 20:08                 ` Lu, Ran
2014-08-28 16:41     ` Sean V Kelley
2014-08-28 17:19       ` Eric Rannaud [this message]

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