I have the dv6-1361sb with HDMI and it's just a bit of fussing with a right click on the desktop then Screen Resolution to play with the settings until I get what I want. The reason the resolution is the same is because of your selected settings.
I bought an hp pavilion dv6-2170us but once i connected it to the lcd with hdmi it didn't work the tv screen stayed black, the screen resolution is the same as the lcd and the cable works fine because we use it on another laptop. The graphics driver is also up to date. what should i do?