[Intel-gfx] [PATCH] drm/i915: set scan-buffer as uncached on Sandybridge

[Clemens Eisserer]

Hi,

>        We only need front buffer to be uncached.
>        I think that will not affect performance since GPU will seldom read back from front buffer.
>        We will measure performance on that.

At least here I have a couple of apps reading back from frontbuffer,
and performance on i945+2.13 is horrible.
No idea if it would be worse on SandyBridge if access is uncached, but
even slower would *really* hurt.

- Clemens