output setup and configuration, what lives where?

[Dave Airlie <airlied gmail com>]

Hey,

So I've been looking at 4K monitors that require DP MST and present as
two screens with some tiling info in the EDID extensions, and I've
been taking a look at how to integrate these with gnome.

Just to clear things up, I tried to hide these in the kernel, the side
effects were too messy to cover up, and stuff broke in wierd ways, so
I've decided to follow Windows and push this up a few levels.

So I've built a kernel property to describe tiles, and passed it
through X to test, and hacked on mutter 3.10, so

a) windows maximize properly
b) initial mutter configuration picks a sane config.

(cgit.freedesktop.org/~airlied/mutter - will eventually have it).

Now the question is what else needs changing for this, I know I should
probably start to target master or least F21 versions and I'll
probably get to that,

I'm getting the feeling at least,
gnome-desktop
and
gnome-control-center

will need work, control-center will probably need design work so the
UI doesn't suck for this use-case.

I'm just not sure how things like monitors.xml fit in, who writes this
file, who reads it, is there
some stuff talking over dbus here, does gnome-session-daemon get
involved anywhere etc, so pointers/answers etc all appreciated.

Dave.