The thread you linked is about audio over the 3.5mm jack.
Audio works fine over HDMI for my PS3.
Thanks for pointing out my error to the thread link. I edited it.
That HDMI audio issue that I had read and was referring to as being discussed was under the Charge accessories forum.
You might find more answers too if you use Google for searches because it covers all Charge forums.
I had questions before I ordered my HDMI cable because I had read in other forums that users were not only having HDMI compatibility issues they were also issues with their particular brand of TV not sending the audio or even video through.
You might want to just bring your cable and Charge to a store like Walmart or Bestbuy and try it out on various brands. Don't forget when you try a TV in a store you might need to use the TV's remote to change the input (and maybe the audio menu input method too).
My cable should be here on Monday (the one that came last week was wrong because I ordered mini not micro) and I'll report back as I have 5 different flat screens of varying brands to test out the HDMI cable on. From what I've read the Sony Bravia is one model that has been giving off issues but that might be just for certain years.
I also have a couple of PS3's which I bought fore their ability to stream Netflix in Dolby 5.1.
Next week that powered converter device that I ordered from Amazon to stream Netflix to RCA's on hotel TV's will arrive too, so I should be able to isolate most any HDMI related issues shortly.
But do try the HDMI to a TV testing in a store rather than waste your time with any customer service reps over the phone as most are clueless (even if you could find one that talks English

).
Accessory hdmi cable out - Android Forums