My old Uverse Moto 1200 STB/DVR that's on my Sharp TV/Onkyo rig, died and it was replaced with the current model. I tried the SURROUND setting on the new VIP2250 /450 STB just now.
On SD TV, the sound on the Sharp receiver via the HDMI is normal. On an HD TV channel, there's no audio on the Sharp TV and on channel change or power up, there's a brief message on the Sharp screen about an "incompatible audio signal". The TOS link to the Onkyo amp works ok and the amp reports Dolby D. The thing is, I don't necessarily want to run the amp and I'd like to get sound either way on the STB "surround" setting.
The Sharp handles decoding the audio from my Sony BD and my old Sony DVD player via the HDMI. The Sharp audio and HDMI menu settings are the same on both inputs.
Short answer, no change. It is annoying. And let me know if you solve it and are able to keep the uverse STB on the "surround" setting full time.
Ref: Sharp LC42D65U