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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Ubuntu12.04.2 Haswell linear framebuffer support under extended mode broken by intel_gen4_compute_offset_xtiled()"
href="https://bugs.freedesktop.org/show_bug.cgi?id=61152#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Ubuntu12.04.2 Haswell linear framebuffer support under extended mode broken by intel_gen4_compute_offset_xtiled()"
href="https://bugs.freedesktop.org/show_bug.cgi?id=61152">bug 61152</a>
from <span class="vcard"><a class="email" href="mailto:kevinliuwt@yahoo.com" title="kevin <kevinliuwt@yahoo.com>"> <span class="fn">kevin</span></a>
</span></b>
<pre>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 <a href="show_bug.cgi?id=61152#c7">comment #7</a>)
<span class="quote">> Kevin, I think Chris was trying to get at another possible solution.</span >
Rather
<span class="quote">> 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.</span >
I still think we need to fix the LinearFramebuffer option, but
<span class="quote">> we should explore something better as well.</span >
Does your driver blit directly
<span class="quote">> 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.</span ></pre>
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