Experimental options

[Ian Romanick]

So, there's three separate issues here.

1. Should the DDX use the DRM to assist with 2D acceleration?

2. How should the server respond to the client's 
is-direct-rendering-capable request?

3. What is the name of the client-side direct-rendering driver?

The second question is irrelevant.  If the answer can ever be yes, just 
make it yes and let the client-side libGL sort it out.

For the second question, I believe that there is already an option for 
that for the R100 & R200 chips.  In either case, this is a good thing to 
have a non-experimental option for.

For the thrid question would make an acceptable experimental option 
during development.