Color profile for GDM login screen

[Alessandro Crismani <alessandro crismani gmail com>]

Hi everybody,

I am trying to set the color profile for my laptop screen for the GDM 
login screen. I can easily use gnome-control-center and import the ICC 
for my user, but how can I do it for GDM?

I tried the "set for all users" option in gnome-control-center, but it 
didn't do any magic. I also tried fiddling with colormgr, with zero luck 
and even less results.

What am I missing?

Thanks a lot for any feedback,
Alessandro

PS: could you kindly keep me CC'ed, as I am not subscribed to the ML? 
Thanks a lot!