[Intel-gfx] [PATCH] drm/i915: enable memory self refresh on 945GM

[Jesse Barnes]

On Wed, 2009-12-09 at 14:20 +0800, Li Peng wrote:
> Hello, Jesse:
> 
> Sorry for the late reply, I missed this email.
> 
> I've tried your patch on 945, but my screen got frozen after booting
> into desktop for a while
> I suspect the frozen is due to memory self refresh isn't disabled by H/W
> automatically. Disabling 
> the SR bit when graphics is busy could avoid this problem.
> 
> I also tried this patch on an old eeepc 701 which has 915GM, but don't
> see obvious power improvement,
> idle power are almost same before and after applying the patch.

Hm, my AspireOne definitely didn't freeze, I wonder if it really is due
to hardware not disabling SR automatically.  Maybe it could be one of
the other clock reduction register writes that's causing the problem?

Jesse