[Intel-gfx] [PATCH] drm/i915:: Disable FBC on SandyBridge

Eugeni Dodonov eugeni at dodonov.net
Tue Jan 17 14:21:08 CET 2012

On Tue, Jan 17, 2012 at 08:57, Daniel Vetter <daniel at ffwll.ch> wrote:

> On Tue, Nov 08, 2011 at 11:17:34PM +0000, Chris Wilson wrote:
> > Enabling FBC is causing the BLT ring to run between 10-100x slower than
> > normal and frequently lockup. The interim solution is disable FBC once
> > more until we know why.
> >
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Iirc fbc isn't really worth it power-wise on snb and we don't implement it
> on
> ivb. So shouldn't we just disable it completely? Eugeni, any opinions - I
> think you're most up to speed on power saving figures for snb?

The FBC is good in some cases and bad in others. Let me confirm with our
windows drivers friends first, but I'd say that we could disable it as it
brings no significant improvements..

Eugeni Dodonov
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