rfc: xserver rebase in F20 (was Re: Slipping F21)

[David Airlie]

> 
> > To add some context the feature that I am asking for is working DRI3 +
> > present ... with mesa 10.2
> > it gives us GLX_EXT_buffer_age which finally fixes tearing issues in
> > mutter that some user are experiencing
> > without using workarounds like forcing the compositor to always redraw
> > the whole screen (which costs performance
> > and battery life).
> 
> There is no working DRI3 + present anywhere at all yet, or if there is
> it involves SNA which has its own set of not working.

And also DRI3 breaks a bunch of working features like gpu offload, again
DRI3 + present is a keithp feature, it works on his laptop so he shipped it.

It needs someone who cares to take over and finish development.

Dave.