[gentoo-user] Very OT - Displaylink adapter and setting up X

[Michael Sullivan]

I feel really stupid asking this, but I want to use an HDMI component to
output one of my PCs to the TV set.  I've followed all of the wiki entry
at http://wiki.gentoo.org/wiki/DisplayLink, but there's something else I
need to know.  I get the green screen on the TV that it mentions when
the kernel module is being loaded correctly.  The problem is that I use
gdm in /etc/conf.d/xdm DISPLAYMANAGER variable to start X, and I don't
know where the actual gdm configuration lives so I can tell it to use
~/.xinitrc2 from the wiki.  My google searching hasn't been going well.
 Can anybody give me any hints as to how to make progress on this problem?