It seems weird that you're not seeing DD, DD EX, DTS or DTS ES when using DVDs. Most recent ones at least have DD 5.1 soundtracks. One thing to check is the audio setup of your DVD player. On some you must set the out to Bitstream so the digital signal gets sent. Otherwise I think only PCM is sent which your HK would see and give you only the simulation modes (DPL, Logic 7, DTS Neo).

Not sure if CDs are the same. Mine's old and only has analog.