[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 #10 from kevin <kevinliuwt at yahoo.com> ---
Jesse,

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.

(In reply to comment #7)
> 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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