It's not especially obvious, and unpleasantly overloaded for the Xnest case. Typically this gives you a server that looks for its auth data in the authority file you were using for the running X session, which generally doesn't have an entry for the display you just started. All the major dm's, and startx, pass -auth explicitly, so this shouldn't cause too much upheaval.
20 KiB
20 KiB