Massive power regression going 3.4->3.5

[Keith Packard]

James Bottomley <James.Bottomley at HansenPartnership.com> writes:

> On Mon, 2012-07-30 at 09:33 -0700, Keith Packard wrote:
>> James Bottomley <James.Bottomley at HansenPartnership.com> writes:
>> 
>> > OK, I've run the bisect as far as I can.  It looks to be in the drm
>> > tree.  Unfortunately, this tree has several merge points, some of which
>> > go further back than v3.4.  Unfortunately, once the bisect steps back
>> > before 3.4, we lose the changes that gave us the power savings, making
>> > further debugging impossible
>> 
>> What machine is this on? There are a few 'disable some power savings'
>> patches in that list to work around issues on various machines; knowing
>> what machine you're using can isolate which ones might have had some
>> effect on power usage...
>
> Lenovo X220i

I don't see a whole lot of context from the elided email bits you'd sent
previously; can you summarize the issue in terms of how much power
savings you're losing, how you're measuring it and what's going on in
the system when the power savings is different?

Have you tried measuring power with X not running? How about with
compositing and other desktop effects disabled? 

-- 
keith.packard at intel.com
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