On my Sony A1 volume controls worked flawlessy. If you disable the SimpleLink function you'll be able to control your Xbox via the IR of the LG remote, but obviously all the HDMI CEC functionalities will be disabled. I hope that the upcoming Xbox update that should bring more efficient CEC support could fix this issue, otherwise I don't know
Disconnect the Beam from HDMI. Then turn off the TV (make sure it’s fully off and not asleep), then reconnect the Beam to the HDMI-ARC port. Disconnect all of the other devices from the HDMI except for the Beam and then set up the Beam. If you have other CEC-enabled HDMI devices, you may want to turn CEC off on them if you don’t use those
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