Since the optical output is fixed level it's warning the user that it connected via such. Your Direct TV remote needs to be programmed to control the vizio bar.
I have a Samsung LED 6400 TV that I keep the sound off on. I have a Vizio 5421 W-C4 sound bar, which I use that has a Bluetooth sub-woofer. I have all this connected to a wireless Direct TV genie receiver.
The soundbar is connected to the TV via optical connections. I control everything with the Direct TV remote. However, if I increase or decrease the sound I get an annoying box that says I am connected to external speakers. I get it each time I use the Direct TV remote. It lasts for a few seconds and goes. However, if I use the Vizio remote I do not get this warning.
Is there any work around for the problem with the Direct TV remote so I don't have to use two remotes?