linux-kernel - Re: [resend] i915: high power consumption after suspend/resume

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Date:	Thu, 29 Oct 2009 13:40:44 -0400
From:	Andrew Lutomirski <luto@....edu>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.sf.net
Subject: Re: [resend] i915: high power consumption after suspend/resume

On Thu, Oct 29, 2009 at 1:22 PM, Andrew Lutomirski <luto@....edu> wrote:
> On Thu, Oct 29, 2009 at 12:47 PM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
>> On Wed, 7 Oct 2009 23:44:35 -0400
>> Andrew Lutomirski <luto@....edu> wrote:
>>> > I probably need to save/restore some more of the power saving state
>>> > across suspend/resume...  Can you file a bug for this at
>>> > bugs.freedesktop.org so it doesn't get lost?
>>>
>>> Submitted as https://bugs.freedesktop.org/show_bug.cgi?id=24386
>>
>> Andrew, are you still seeing this after the various fixes that have
>> landed in Linus's tree?
>
> I'm not entirely convinced it's suspend/resume related any more, but
> there's still a problem.  When I got your email, my system had been up
> for awhile (running Linus' 964fe080d94db82a3268443e9b9ece4c60246414
> (approximately 2.6.32-rc5) plus drm-intel/for-linus from a couple days
> ago for the watermark fix)), suspended and resumed several times, and
> logged in and out several times.  I turned off wireless and power
> consumption was 9.0 watts.
>
> I switched to console and killed X.  Power consumption still 9.0
> watts.  The system was almost completely idle.
>
> I rebound i915.  Power consumption dropped to 7.3 watts.
>
> I restarted X and logged back in.  System froze hard (whoops).
>
> It looks like something is getting the chip stuck in a high-power state.

I just suspended and resumed and power consumption stayed low.  I'll
try and get an intel_reg_dumper diff next time I trigger this bug.

--Andy
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