[Intel-gfx] [PATCH] add LVDS downclocking support

[Erik Andrén]

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Jesse Barnes wrote:
> This is a refreshed patch from Matthew Garrett to enable LVDS downclocking.
> 965+ hardware can do this automatically, but other 9xx chips need some help. 
> So this patch adds some damage code to track idle time.  If we're idle for
> more than 500ms we downclock the display based on the value calculated at
> mode set time.
> 
> Comments & testing appreciated.  I've only tested on my GM45 so far, and I
> think to fully realize the benefits we'll need to enable self refresh, but it
> should help on many platforms as-is.
> 

Hi,
I've tested this on my 965GM laptop applied on top of Ubuntu Jauntys
2.6.3 version of the intel driver. When measuring with my Energy
Monitor 3000 [1] I did not record any power savings at all. In fact,
I saw an increase of a couple of deciwatts. (Could be a measuring
error though).
Otherwise the system seemed stable and functioned as expected.

What is the expected power decrease when using this patch?

Best regards,
Erik Andrén


[1]
http://www.alamaison.com.au/p/361923/voltcraft-plus-energy-monitor-3000.html
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