ubuntu-x-swat team mailing list archive

[Eugeni Dodonov <755841@xxxxxxxxxxxxxxxxxx>]

So, just as an update here while still working on a fix.

You should not experience tearing if you disable compositing and use gl
or vaapi output. Tearing still happens with xv/x11 due to vsync not
working properly on Sandy Bridge yet, even with compositing disabled.

With compositing enabled, I guess there is not much to do - the problem
happens due to the nature of compositing itself. When it is used, the
windows do not render directly to screen, but to an off-screen area. So
the vsync is not helpful in any case - the off-screen does not
synchronizes itself with it. Such tearing is not Intel-specific, it also
happens on nvidia
(http://www.nvnews.net/vbulletin/showthread.php?t=149276,
http://nvnews.net/vbulletin/showthread.php?t=149776), and there is a
nice description at https://bugzilla.gnome.org/show_bug.cgi?id=562669 as
well.

As for the vsync fix for making it work with xv/x11, I still don't have
a working fix for it. I'll keep this bug updated when I'll have one.

Thanks!
Eugeni

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https://bugs.launchpad.net/bugs/755841

Title:
  [sandybridge] video tearing

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