[Intel-gfx] FBC patchset

Chris Wilson chris at chris-wilson.co.uk
Tue Jan 17 17:57:03 CET 2012

On Tue, 17 Jan 2012 17:18:17 +0100, Daniel Vetter <daniel at ffwll.ch> wrote:
> I've just noticed that we seem to miss this plug to fix fbc issues. Care
> to resend a proper patch in case we still need this?
> Also, I we could try to also disable fbc when we detect frontbuffer
> rendering (and generally abolish setting up the fence to detect such
> writes), maybe that helps with our fbc troubles (if it's actually worth
> it). Eugeni?

I'm testing whether disabling fbc when fb is busy helps on my
troublesome SNB. But X can and will still access the scanout through a
fence, so we can't simply abolish setting up fences here. The other
recourse is to always used a shadow buffer so that we never access the
scanout directly, and perhaps restrict that to only use render as well.

Chris Wilson, Intel Open Source Technology Centre

More information about the Intel-gfx mailing list