Universal media_player does not show source button

Configuration
1

Hi all,
I’m trying to create a universal media_player to drive my old Rotel RSP980 via Broadlink IR.
I created an helpler to support the state of the mute button and another helper to support the source selection.

Here is the relevant config:

media_player:
  - platform: universal
    name: Rotel RSP-980
    unique_id: rotel_rsp980
    device_class: receiver
    commands:
      turn_on:
        service: script.turn_on
        data:
          entity_id: script.1602356187424
      turn_off:
        service: script.turn_on
        data:
          entity_id: script.1602444332250
      volume_mute:
        service: script.rotel_toggle_mute
      volume_up:
        service: remote.send_command
        data:
          command: >-
            b64:JgBYAAABJ5UROBI4EhMSFBISEhQRFBE4EjgTEhEUExISOBITExIRFBMSEzcROREUEjgRFBITEhMSNxMSEhQSNxIUETgSOBI4EwAFjwABJ0oUAAxYAAEoSRQADQU=
          num_repeats: 2
        target:
          entity_id: remote.rmproplus_soggiorno_remote
      volume_down:
        service: remote.send_command
        data:
          command: >-
            b64:JgBYAAABKJQTNxM3EhMTExEUERMSFBE4EzcRFBITEhMRORITERQRFBI4ETkROBITEzcSExIUERQSEhIUERQROBIUETgSOBE5EgAFkAABJ0oTAAxZAAEoSRIADQU=
          num_repeats: 2
        target:
          entity_id: remote.rmproplus_soggiorno_remote
      media_previous_track:
        service: remote.send_command
        data:
          command: >-
            b64:JgBYAB4cOzo7OjsdHjk8HB4dHhweOh4AC48eHDw5PDk8HB45Ox0fHB4cHzkeAAuOHh07OTw5PBwfOTscHxweHB85HwALjR4dOzo7OjscHjo7HR4cHh0eOR4ADQU=
        target:
          entity_id: remote.rmproplus_soggiorno_remote
      media_play:
        service: remote.send_command
        data:
          command: >-
            b64:JgCEAB8cHhwfHDs5PBwfOR4cPDk8OR8AC40fHB4cHxw8OTscHzkfHDs5PDkfAAuNHxweHR4cOzo7HR45Hh07Ojs6HgALjx4cHxweHDw5PBweOR8cPDk8OR4AC44eHB8cHhw8OTwcHjoeHDw5PDkfAAuNHh0eHB4dOzk8HB46Hhw8OTw5HgANBQAAAAA=
        target:
          entity_id: remote.rmproplus_soggiorno_remote
      media_next_track:
        service: remote.send_command
        data:
          command: >-
            b64:JgCEAB8cPDk7OjscHzk8HB4cHxweHB8AC6seHDw5PDk8HB45PBwfHB4cHxsfAAurHhw8OTw5Ox0eOjscHh0eHB4dHgALrB8bPDk8OTwcHzk7HB8cHhwfHB4AC6sfHDs6Ozk8HB85PBweHB8cHhwfAAuqHxw7Ojs6OxwfOTsdHhweHR4cHgANBQAAAAA=
        target:
          entity_id: remote.rmproplus_soggiorno_remote
      media_pause:
        service: remote.send_command
        data:
          command: >-
            b64:JgBuAB4dOzk8OToeHjoeHDwcHh0eHB4AC6wfHDs6Ozk8HB85Hxs8HB8cHhwfAAuqHxw8OTw5PBsfOR8cOxwfHB4cHwALqx4cOzo7OjsdHjkeHTsdHhweHR4AC6weHDw5PDk8HB45Hxw8HB4cHxweAA0FAAAAAAAAAAAAAA=
        target:
          entity_id: remote.rmproplus_soggiorno_remote           
    source_list:
      - Phono 
      - CD
      - Tuner
      - Video1
      - Video2
      - Video3
    select_source:
      service: script.rotel_select_source
      data:
        source: "{{ source }}"
    attributes:
      state: switch.stereo_switch
      source: input_select.rotel_source
      is_volume_muted: input_boolean.rotel_mute

The problem is that in the media_player is missing the sourc button and the supported_features misses the 2048 value.
Any clue?

2

I forgot to post attribuites for the entity (when powered on):

device_class: receiver
friendly_name: Rotel RSP-980
supported_features: 17849
is_volume_muted: false
source: CD

Regards