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List:       freedesktop-intel-gfx
Subject:    [Intel-gfx] [PATCH 0/2] drm/i915: enable CxSR and FBC on Sandybridge
From:       michael_fu () linux ! intel ! com (Fu Michael)
Date:       2010-12-16 22:47:50
Message-ID: 4D0A9716.3060501 () linux ! intel ! com
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On 2010/12/16 18:09, Yuanhan Liu wrote:
> On Wed, Dec 15, 2010 at 10:32:50AM +0000, Chris Wilson wrote:
>> On Wed, 15 Dec 2010 15:42:30 +0800, Yuanhan Liu<yuanhan.liu at linux.intel.com>  wrote:
>>> Hi,
>>>
>>> This two patches enable self refresh and frame buffer compression
>>> on Sandybridge.
>>>
>>> FYI, with my test, enable CxSR would save about 0.7W, while enable
>>> FBC would save about 0.1~0.2W.
>>
>> Do you have some numbers comparable to
>> https://bugs.freedesktop.org/show_bug.cgi?id=31588 ?
>> I'm interested to know if, first, we are able to reproduce those numbers
>> and,
>
> Will update it at bugzilla soon.
>
>> secondly, if we've started to narrow the 3W gap for enabling a pipe
>> between the Windows driver and ourselves.
>
> This two patches mostly save just about 1W;)
>

Based on experience from previous generation, it's pretty much that 
number, and another 1W idle power can be saved from Render-C. those are 
pretty much the HW power saving feature we can leverage now.

Another feature called DPST which basically adjust backlight based on 
color histogram can't be open sourced. Not sure if it's enabled in the 
windows test environment in bug# 31588.

>
> Thanks.
> Yuanhan Liu
>
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> Intel-gfx at lists.freedesktop.org
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