Present extension and TearFree on Intel

[Keith Packard]

Keith Winstein <keithw at cs.stanford.edu> writes:

> Hello all,
>
> First off, thank you for making the Present extension -- it looks like a
> very welcome addition to X11.
>
> I am trying to use PresentPixmap to display a pixmap in vblank-synchronized
> manner with Xorg 1.15.1, xserver-xorg-video-intel 2:2.99.910-0ubuntu1.2,
> and Intel HD Graphics 3000, but in practice we see lots of tearing unless
> we enable the "TearFree" option. This does not seem to be the default with
> a blank xorg.conf.

You might want to switch to UXA acceleration; the default SNA has
significant problems with DRI3.

> By contrast, OpenGL code that uses the swap interval extensions works great
> out of the box.

that's good to hear!

-- 
keith.packard at intel.com
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