[Bug 61152] Ubuntu12.04.2 LinearFramebuffer 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 #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #10)
> AMD driver render the desktop and blit the content to intel framebuffer.
> However, AMD blit engine could not recognize intel tiling mode, so upon on
> preInit, we force intel driver working under linear frame buffer mode to do
> the right bliting.

You could have staged that transfer through a linear back buffer rather than
force the framebuffer to be linear. Or compute the swizzling in a shader.

With the master/slave pixmap introduced for PRIME, we should be able to create
an interface that is analogous to dma-buf so that we do not have to apply so
many contortions.

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