[ubuntu-x] Compiz without composite

[Christopher James Halse Rogers]

On Sat, 2011-01-15 at 15:38 -0500, Felix Kuehling wrote:
> In some cases our proprietary driver disables the Composite extension in
> the Xserver. On previous Ubuntu versions that would make compiz fail and
> fall back to metacity.
> 
> In current Natty, compiz will start even without the Composite
> extension. The result looks and feels much worse than plain metacity.
> 
> You should be able to reproduce this with any driver by adding this to
> your xorg.conf:
> 
> Section "Extensions"
> 	Option "Composite" "disable"
> EndSection
> 
> Is compiz "working" without Composite intentionally or accidentally? I
> read on Phoronix that Canonical was working on making Unity work without
> 3D. Is this part of that development?
> 

Compiz working without Composite is intentional, at least as far as the
Compiz developers are concerned.  I'm uncertain what window manager the
Qt Unity shell is going to use, but checking for Composite should be a
part of the detection mechanism for switching from the 3D unity.

As it's very rare for Composite to not be available it's entirely
possible that this check has not been implemented.  We should check this
again post-alpha 2, when I think the fallover detection should be done.
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