Sometimes that is an issue with the multi-channel capabilities being disabled in the BIOS. Don't abandon hope till you rule that out.It's fairly rare ( though more common on older PCs ), but not every HDMI equipped PC is able to output multi-channel sound through the HDMI connector .
In your case ( with a new 2014 laptop still under a warranty ) I would seek help from the people who sold you the computer .flamingeye said:<<<<SNIP>>>>I'm PC illiterate how do you find out if the BIOS disabled the multi-channel and if the BIOS disabled the multi-channel capability what then ? is there a way to re-instate it ? I have a 2014 ASUS laptop with i7 and a realtek High definition audio with HDMI and I only see 2 channels ,<<<<SNIP>>>>