XGL Composite annoyance on Edgy

[Nils]

Hi all,

I found several problems that are caused because composite is enabled
on Edgy if you don't explicitly disable it. For example, if you use
fglrx you are likely to run into trouble, because of it.

>From the wiki [1]:

In Ubuntu Edgy the Composite extension is enabled by default, however,
fglrx does not yet support Composite with DRI. In order to to disable
Composite you have to edit the /etc/X11/xorg.conf file, so add these
lines at the end of xorg.conf:

Section "Extensions"
        Option  "Composite" "Disable"
EndSection

At least it's documented, but you get annoyed until you have a look at
the wiki.. However, today I ran into a problem with an i810 GPU: It
was completely unable to display videos (excepted with mplayer -vo gl,
but that was too slow since DRI did not work too). Then I added the
same lines as above to the xorg.conf and it worked again.

I also tried get DRI working, but it did not (not sure if the driver
or the GPU supports it).

If I didn't ran in the issue with fglrx first, I'm not sure how much
time I would have wasted to get the video output running. I also think
that this is a major bug in the Edgy release that should not happen..

Nils

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[1] https://help.ubuntu.com/community/BinaryDriverHowto/ATI