Bug#694929: Default behaviour must change

[Chris Carr]

Josselin Mouette said:

> "I’m not sure it’s a good idea to include use of an experimental API
right before a stable release…"

This is true, but it's an even worse idea to have a stable release ship
with an unmodified default installation of gnome resulting in an
unusable interface. 

The best interim solution might be to fall back to Gnome Classic for
these cards, with an advisory message about this bug.

CC