compiz team mailing list archive

[Nicholas Janssen <XNICHOLAS@xxxxxxxxx>]

*** This bug is a duplicate of bug 212587 ***
    https://bugs.launchpad.net/bugs/212587

Graeme:

Hai, can you think of any test to determine if vsync is working? When
I move windows rapidly, and then do printscreen, i get massively
distorted images. Fedora also seems to be effected, yet this glitch?
never happens on windows xp.

http://i44.tinypic.com/24l6kgx.png ( pretty fast)

http://i43.tinypic.com/13ygg41.png ( very slow movement)

What do you think?

On Tue, Jun 23, 2009 at 10:04 AM, Graeme Humphries<graeme@xxxxxxx> wrote:
> *** This bug is a duplicate of bug 212587 ***
>    https://bugs.launchpad.net/bugs/212587
>
> Nick:
>
> You can't check the framebuffers for vsync problems, because it's not an
> issue that'll show up in the framebuffer. Typically, in applications
> that attempt to do vsync, there are two complete, correct buffers. The
> app then swaps the inactive (back) buffer to screen when the monitor is
> doing its vertical sync, (ie, not drawing to the screen) so that screen
> updates aren't visible to the user. If there's a problem with that code,
> it swaps the buffers in the middle of drawing the screen, and you see
> the "tearing" effect.
>
> So there's really nothing to check in the buffers, as they'll likely
> always be correct. The problem is a matter of timing: when is compiz or
> whatever window manager you're using swapping the buffers? And why isn't
> it doing it during the monitor vsync?
>
> --
> Slight ripping of video when compiz is enabled
> https://bugs.launchpad.net/bugs/288822
> You received this bug notification because you are a direct subscriber
> of the bug (via bug 212587).
>
> Status in “compiz” source package in Ubuntu: New
>
> Bug description:
> Binary package hint: compiz
>
> While watching movies I see slight ripping during fast video playback with any player only when compiz is enabled
>

-- 
Slight ripping of video when compiz is enabled
https://bugs.launchpad.net/bugs/288822
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