I read on ArsTechnica that the Shield supports CEC for volume. ( http://arstechnica.com/gadgets/2015/05/hands-on-again-with-the-nvidia-shield-the-first-good-android-tv-device/ ) How does that work on the Remote or the Controller? The article says there are volume buttons but I don't see any. What about powering on and off? I'm seriously considering the Shield TV. Now that SlingTV and the Live TV (with HDHomeRun support) apps have come to Android TV to fill in the live TV hole, and Nvidia's game stream can help with TV gaming from my PC I really think I could finally go with only one device under my TV. I would love to only use a single remote, too. (I've already got a harmony remote. And it's very good, but still not as smooth as it should be.)
Here are shots of the HDMI CEC options in settings I found (btw, the built in screenshot and share to Google Photos feature is dope). I had the same questions.
I have shield -> tv -> AVR (viai HDMI ARC). The entire systems turns on when I turn on controller and tunes to right inputs. However, I turned on HDMI volume control and it doesn't seem to work, unless I'm doing it wrong. When I turned on volume control, it would only mute the sound to the system, it didn't adjust volume.
I'll try some more and report back. FWIW, I hate st60 panny TV and onkyo tx nr 515. Maybe there's a setting in my AVR I need to flip?
http://imgur.com/a/y10nH
BTW, I'm using it with a harmony setup. Works well. I think the built-in IR was great.
EDIT: forgot to say, one of my issues is the lack of a power off command that I can find. Try inputting the Shield into your harmony app and I think you'll see all of the commands it supports--none are power off. I did read some guy has his stuff to auto-off after 10 mins, but not sure that will work for me. I bet they add this soon. At least there's a power off menu at all.