When I connect my laptop, it's with HDMI cable to the receiver and the receiver does the audio and passes the video up to the HDTV. The thing about this is that it's very fiddly. I have to change my display settings in Windows to extend the desktop, make the external HDTV the primary display and WHAT A MESS!
No step by step because it varied with my 3 test laptops. One had Nvidia, the next ATI and the last was Intel (display chips.)
Not one system required the same steps to make it all work. This is why I wonder if this is too much for most owners.