[Intel-gfx] [PATCH] drm/i915: add render standby support
luto at mit.edu
Thu Oct 8 18:55:00 CEST 2009
On Thu, Oct 8, 2009 at 12:46 PM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> On Thu, 8 Oct 2009 12:04:32 +0200
> Erik Andrén <erik.andren at gmail.com> wrote:
>> 2009/10/7 Jesse Barnes <jbarnes at virtuousgeek.org>:
>> > Render standy allows the GPU to power down the render unit when
>> > idle. In order for this to work, it needs a page of graphics memory
>> > to save state. This patch allocates that page and enables the
>> > feature on supported chipsets.
>> > Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
>> > ---
>> Do you have any figures on how much power this saves?
> I haven't done any measurements yet. I had to do this as part of some
> other work and figured I'd get it out there after some light testing.
For fun, I compiled and ran it on my laptop. I didn't get any
noticeable savings over 2.6.32-rc3 (with a hack added in to
force-enable render_reclock_avail and lvds_downclock_avail on my
GM45), but nothing went wrong either.
While I'm here, silly question: what's supposed to enable lvds_downclock_avail?
> Jesse Barnes, Intel Open Source Technology Center
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
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