After further work I can add that Argyll isn't a default install.
Also I can confirm bdaggg's observation in #14 that removing the nvidia binary (closed) driver from my system allows Gnome Color Manager to function as I would expect.
After further work I can add that Argyll isn't a default install.
Also I can confirm bdaggg's observation in #14 that removing the nvidia binary (closed) driver from my system allows Gnome Color Manager to function as I would expect.