[Bug 61152] Ubuntu12.04.2 Haswell linear framebuffer support under extended mode broken by intel_gen4_compute_offset_xtiled()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61152

--- Comment #7 from Jesse Barnes <jbarnes at virtuousgeek.org> ---
Kevin, I think Chris was trying to get at another possible solution.

Rather than relying on a linear framebuffer, maybe we could invent some new
interfaces between our driver and the AMD driver that might allow for higher
performance.

I still think we need to fix the LinearFramebuffer option, but we should
explore something better as well.

Does your driver blit directly into the framebuffer we use for scanout?  Or do
you blit from it to get current screen contents?  Either way, we may be able to
be more efficient if we can leave the scanout buffer in tiled format and use
the Intel BLT engine to do tile conversion for us.

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