Je viens d'activer les logs et j'ai fait un test avant et après avoir débranche le câble USB.
Je trouve cela dans les logs (pas très claire pour moi) :
{ "airplay" : [], "bluetooth" : [], "collector_version" : 1, "upnp" : [], "usb" : { "interface" : "CMEDIA USB2.0 High-Speed True HD Audio at usb-0000:05:00.0-2, high speed : USB Audio\n\ nPlayback:\n Status: Stop\n Interface 1\n Altset 1\n Format: S16_LE\n Channels: 2\n Endpoint: 5 OUT (ASYNC)\n Rates: 44100, 48000, 88200, 96000, 176400, 192000\n Data packet interval: 125 us\n Interface 1\n Altset 2\n Format: S24_3LE\n Channels: 2\n Endpoint: 5 OUT (ASYNC)\n Rates: 44100, 48000, 88200, 96000, 176400, 192000\n Data packet interval: 125 us\n Interface 1\n Altset 3\n Format: S32_LE\n Channels: 2\n Endpoint: 5 OUT (ASYNC)\n Rates: 44100, 48000, 88200, 96000, 176400, 192000\n Data packet interval: 125 us\n", mixer" : "USB Mixer: usb_id=0x0d8c0319, ctrlif=0, ctlerr=0\nCard: CMEDIA USB2.0 High-Speed True HD Audio at usb-0000:05:00.0-2, high speed\n Unit: 13\n Control: name=\"Speaker Playback Switch\", index=0\n Info: id=13, control=1, cmask=0x0, channels=1, type=\"INV_BOOLEAN\"\n Volume: min=0, max=1, dBmin=0, dBmax=0\n", "name" : "CMEDIA USB2.0 High-Speed True HD Audio" }}