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

[Peng Li]

> 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
>
>

I have filed a bug https://bugs.freedesktop.org/show_bug.cgi?id=25553
Let's track this issue in bugzilla.