With USB Audio as well as with Unicens, if we use Speaker test on Emergency, we have a fading out as soon as the sounds starts.

If re-adjusting the volume up by Alamixer, the sound comes back. But same fading will happen for any furthertest.

What is surprising, is that the ramping up/down declared in the HAL for emergency is configured 10/2. Here we see that the ramping down is done by step of 5

See 4a debug.

-------------------------- log -----------------------------

HOOK: [xreq-000388:ahl-4a/stream_open] BEGIN uid=0=0 gid=0 pid=1064 label=System id=System
HOOK: [xreq-000388:ahl-4a/stream_open] json() -> { "audio_role": "Emergency", "endpoint_type": "sink" }
HOOK: [xreq-000389:usb-audio/ctlget] BEGIN
HOOK: [xreq-000389:usb-audio/ctlget] json() -> { "label": "Emergency_Volume" }
HOOK: [xreq-000390:alsacore/ctlget] BEGIN
HOOK: [xreq-000390:alsacore/ctlget] json() -> { "devid": "hw:0", "ctl": [ 5 ] }
HOOK: [xreq-000390:alsacore/ctlget] success({ "id": 5, "val": [ 204, 204 ] }, (null))
HOOK: [xreq-000390:alsacore/ctlget] END
HOOK: [xreq-000389:usb-audio/ctlget] success({ "label": "Emergency_Volume", "tag": 12, "val": [ 80, 80 ] }, (null))
HOOK: [xreq-000389:usb-audio/ctlget] END
HOOK: [xreq-000388:ahl-4a/stream_open] subscribe(ahl-4a/ahl_streamstate_12:20) -> 0
HOOK: [xreq-000388:ahl-4a/stream_open] success({ "stream_id": 12, "state": "idle", "mute": "off", "device_uri": "plug:Emergency_Main", "endpoint_info": { "endpoint_id": 0, "endpoint_type": "sink", "device_name": "AUDIO", "display_name": "USB-Audio", "audio_role": "Emergency", "device_domain": "alsa", "device_uri_type": "plug", "format": { "sample_rate": -1, "num_channels": -1, "sample_type": -1 }, "property_table": [ ] } }, Stream info structure)
HOOK: [xreq-000388:ahl-4a/stream_open] END
HOOK: [xreq-000391:ahl-4a/set_stream_state] BEGIN uid=0=0 gid=0 pid=1064 label=System id=System
HOOK: [xreq-000391:ahl-4a/set_stream_state] json() -> { "state": "running" }
HOOK: [xreq-000392:usb-audio/ctlset] BEGIN
HOOK: [xreq-000392:usb-audio/ctlset] json() -> { "label": "Emergency_Ramp", "val": 0 }
HOOK: [xreq-000393:alsacore/ctlset] BEGIN
HOOK: [xreq-000393:alsacore/ctlset] json() -> { "devid": "hw:0", "ctl": { "id": 17, "val": [ 0 ] } }
HOOK: [xreq-000393:alsacore/ctlset] success(null, (null))
HOOK: [xreq-000393:alsacore/ctlset] END
HOOK: [xreq-000392:usb-audio/ctlset] success(null, (null))
HOOK: [xreq-000392:usb-audio/ctlset] END
ERROR: [API ahl-4a] Unable to find endpoint [/usr/src/debug/agl-service-audio-4a/0.1+gitAUTOINC+7c3b7df2b1-r0/git/ahl-binding/ahl-binding.c:1209,audiohlapi_raise_event]
HOOK: [xreq-000391:ahl-4a/set_stream_state] success(null, Set stream state)
HOOK: [xreq-000391:ahl-4a/set_stream_state] END
HOOK: [xreq-000394:alsacore/ctlget] BEGIN
HOOK: [xreq-000394:alsacore/ctlget] json() -> { "devid": "hw:0", "ctl": 5 }
HOOK: [xreq-000394:alsacore/ctlget] success({ "id": 5, "val": [ 204, 204 ] }, (null))
HOOK: [xreq-000394:alsacore/ctlget] END
HOOK: [xreq-000395:alsacore/ctlset] BEGIN
HOOK: [xreq-000395:alsacore/ctlset] json() -> { "devid": "hw:0", "ctl": [ 5, [ 198 ] ] }
HOOK: [xreq-000395:alsacore/ctlset] success(null, (null))
HOOK: [xreq-000395:alsacore/ctlset] END
HOOK: [xreq-000396:alsacore/ctlset] BEGIN
HOOK: [xreq-000396:alsacore/ctlset] json() -> { "devid": "hw:0", "ctl": [ 5, [ 193 ] ] }
HOOK: [xreq-000396:alsacore/ctlset] success(null, (null))
HOOK: [xreq-000396:alsacore/ctlset] END
HOOK: [xreq-000397:alsacore/ctlset] BEGIN
HOOK: [xreq-000397:alsacore/ctlset] json() -> { "devid": "hw:0", "ctl": [ 5, [ 188 ] ] }
HOOK: [xreq-000397:alsacore/ctlset] success(null, (null))
HOOK: [xreq-000397:alsacore/ctlset] END
HOOK: [xreq-000398:alsacore/ctlset] BEGIN
HOOK: [xreq-000398:alsacore/ctlset] json() -> { "devid": "hw:0", "ctl": [ 5, [ 183 ] ] }