Just thought I’d quickly post my experience here and thank the OP and @duduke for the above instructions.
video=LVDS-1:d confirmed working when added directly above all other video setting lines in the config file.
In my case, I added the line and changed monitor index to 2 and am now sending HDMI video from a native 1366 x 768 Toshiba Qosmio F60 to a 1920 x 1080 Samsung 60 inch TV.
Audio took a bit more tinkering but I found references to the aplay -l command and got that sorted also.
Thanks again for the time you took to post your solution @waveofpopularfeeling