I'm open to negotiation for this, but basically...gdm is at
present second only to the kernel in the sheer amount of spew
it emits - when the version is "unstable".  But it always will
be for Continuous.

Nowadays of course, I think Continuous helps act as a testing system
for GDM that obviates a lot of the need for lots of debugging info for
gdm during "unstable" cycles.

I suspect that we will over time add other informational messages at
strategic points by default; this patch is not the end of the story.
It's a new beginning.

https://bugzilla.gnome.org/show_bug.cgi?id=715037