Hello,
Before all, I want to clarify that problems does not exist on OpenElec 6.0.3. I already tried with a fresh install and I had the same problems.
1 – When LibreElec starts or I switch TV source to LibreElec, my TV automatically change speaker selection to “Home cinema”.
2 – After change speaker selection manually, I have no sounds. I need to go to Kodi System menu and make no changes, but sound works.
More infos : I use HDMI CEC adapter and Yamaha sound bar with HDMI Arc but Kodi connected via Optical.
Thanks for your help and sorry for my bad English.