Hi guys .. I have a question here, and I'm not really sure if my laptop drivers are at fault, or is my general home theater system setup at fault .. I have a Sony F13 laptop, which I connect to my Sony BRAVIA 46EX720 to watch movies on the big screen ... This 46EX720 is then connected to a Sony DAV-DZ640K Home Theater System, via a HDMI Audio Return cable .. Now, when I connect my PC to my 46EX720 HDTV via a HDMI cable, I only get 2 audio channels, as can be seen here: But ... My PS3 and Xbox 360 detect 5.1 audio, and they also connect more or less in the same way PS3 46EX720 DAV-DZ640K Xbox 360 46EX720 DAV-DZ640K So I'm not sure if my Laptop is at fault, for not detecting 5.1 channels, or is my TV at fault, for not telling the Laptop that it can only support 2 audio channels, whereas it can actually support 5.1 too, because its itself sending all audio data to a home theater system its connected to .. For my PC, I have tried 3 sets of audio drivers: 1) the latest NVidia Graphics Drivers (which also install the NVida HD Audio Drivers) 2) the Realtek HD Audio drivers from my Laptop's manufacturer's (Sony) site 3) the Realtek HD Audio drivers from Realtek's website On all three, upon connecting the laptop to EX46720, I only get 2 audio channels in stereo formation ... So what's at fault here ? Any ideas ?