I'm using a Sony BRAVIA TV equipped with Google TV. A Pioneer Elite home theater system is plugged in to the ARC-enabled HDMI port. When I try to adjust the volume with the TV remote, the receiver only changes the volume within a range that isn't perfectly consistent; usually displaying around -45 dB at minimum to -30 dB at maximum, while the TV is displaying a range from 0 at minimum to 100 at maximum (generic volume units, not dB, I assume). This is not the result I expect or want. Sound-wise, the difference between the ends of that range is not dramatic at all. In fact I'd say it's barely noticeable. I would expect the minimum volume to be silent, and the maximum to be damaging to my hearing (because it's the maximum volume the home theater can produce, which is very loud). Any tips or advice?
I have this issue too. Not sure if it's the same model, but I also have a Sony BRAVIA with Google connected to a Denon AVR.
What I have found as a somewhat annoying workaround is to change the volume on the TV with slow, deliberate presses of the volume buttons. If I hold down the volume button the AVR can't 'keep up' and the volume doesn't change as much on the AVR as it does on the TV. Slow presses of the volume buttons allow the AVR and TV to keep the volume in sync.
That is my experience, as well. That's not workable, since it would take an extremely long time to change the volume by a meaningful amount. I guess I'll need to keep my receiver remote out for volume control.
I have a Bravia XR65X95K and a Denon receiver. I've got it set so that I control everything with the Sony remote. There is a little lag when changing the volume but it's always in sync if that makes sense. I'm not at home but I can show my settings later if that helps. Maybe post yours and I can tell you what's different.
You may be able to get more granularity by decoupling Google TV volume from the TV's own volume. To do this, you need to disable HDMI CEC control over volume in the remote's settings.