monitor setting in gnome using new randr 1.5 option

[Stephen Adler <adler stephenadler com>]

Guys,

I have 3 MST type 4K monitor hooked up to my PC and I've been trying to 
get linux to work properly and have been chopping at the bit for randr 
1.5 to come out which is supposed to solve the MST tile issue which 4K 
monitors suffer from.

Is there something I have to do, configure some file in /etc/ somewhere 
which would define which tiles make up a monitor? I'm not sure if there 
is something I have to do, or if gnome is supposed to take care of the 
tiling for me, by somehow defining which tiles are part of which monitor.

to make matters worse, I have a pair of nvidia cards for which the 
nvidia driver does not support xorg 1.18, so I had to downgrade to xorg 
1.17. In doing so, I still have randr 1.5 installed but I don't know if 
randr 1.5 needs xorg 1.18 or if the two are decoupled enough so that I 
can run xorg 1.17 with the nvidia driver and get the benefits of the 
monitor features of randr 1.5.

Anyone know the answer to all this? I owe you big if you do.

thanks. Steve.