I subscribed Bryce Harrington, too. ~bryce, you were erroneously
subscribed, sorry; please unsubscribe again if you want.

compiz needs composite *and* 3D; I assume metacity+compositing only
needs compositing? would it be sufficient to look for

  [    3.078905] (II)         Composite (RENDER acceleration)

in Xorg.0.log? Is there a better way to detect compositing availability?

I have looked at metacity compositing at the sprint, and it doesn't do a
lot; basically, transparency and drop shadows. However, that might be
enough for notify-osd, of course.

My concerns here:

 * The _real_ problem is that notify-osd does not look "good enough" on
metacity. This needs to be fixed eiter way, since there will always be
drivers which does not support compositing (vesa, nv, all the old ones
like cirrus, etc.)

 * Introducing metacity+composite at this point of the release cycle
seems dangerous to me, since it will come with its own set of bugs,
uncover compositing bugs in drivers, and thus lead to hardware support
regressions.

Thus this is an interesting option to explore for future releases, but
I'd give my nack for Jaunty for this.

-- 
enable composting in metacity by default
https://bugs.launchpad.net/bugs/334063
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