There is a thread about the issue. Please use it instead.
TL;DR unplugging and plugging the HDMI cable back to the TV fixes the problem until the TV is turned off. Next time the TV is on I have to repeat this.
I have the following setup:
TV: LG SK8500PL
SW Version: 05.50.10
webOS TV Version: 4.4.2-10 (goldilocks-gorongosa)
Soundbar: Samsung Q950A connected via HDMI ARC port.
It used to work OK but one day it stopped reproducing sound from the soundbar. When I try to adjust the volume I just have a grey DISABLED icon.
So far, I have tried to play with all kind of options from the menu of the TV and I have power cycled it, factory reset the TV as well. I have tested the soundbar and the cable with my other LG TV and it works perfectly. I am assuming it is a hardware problem with the port, but I just wanted to ask here for any advice?
Today unplugged and replugged the cable (again). The issue was gone. Could be some SW update on the Soundbar as I had a BT sync issues which are now gone.