Choose sources of ONKYO on Home assistant

Third party integrations
2

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select_source requires you to specify the source as data. See if this works:
And you’re calling the wrong service, I think.

- service: media_player.select_source
  entity_id: media_player.receiver_onkyo
  data:
    source: PC

Experiment using the services dev tool in the HA interface.

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