Comment 4 for bug 764282

You can change it by editing the theme file

eg /usr/share/themes/Ambiance/metacity-1/metacity-theme-1.xml

Also, if you use a theme which doesn't explicitly set shadow
properties, the settings in the compiz decor plugin will take effect.

On Fri, Jun 3, 2011 at 12:08 AM, Benjamin Schmid
<email address hidden> wrote:
> I share the same problem: I'm trying to disable window shadows for
> performance reasons as unity turns out a bit slow on my Neo II K325 but
> failed.
>
> In the related Bug Sam Spilsbury wrote: "This is intentional. In U-W-D
> the shadow is controlled by the theme now.". So it can'T be changed at
> all?
>
> --
> You received this bug notification because you are a member of compiz
> packagers, which is subscribed to compiz in Ubuntu.
> https://bugs.launchpad.net/bugs/764282
>
> Title:
>  Can't disable active window shadow in compiz-decorator
>
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--
Sam Spilsbury