These two related Jiras are about problems of integrating CDI with an installed JSF implementation that is not the default.
https://issues.jboss.org/browse/AS7-1628
https://issues.jboss.org/browse/AS7-6129
There is a workaround, however. If I remember correctly, the workaround is to change the JSF impl that Weld is looking at. Go into modules/org/jboss/as/weld/main/modules.xml and add your slot to the JSF API.
<module name="javax.faces.api" slot="myfaces-2.1.10"/>
Note that with this change you can only use Weld/CDI with one JSF impl at a time. This limitation is slated to be fixed in AS7.2.x.