When I press and hold volume down button with screen off, the phone beeps twice. How do I disable it? When I press and hold the volume down button on Huawei Honor 6, it beeps two times, even if the device is in silent mode. Between the beeps I see logcat message like this:

D/VARecorder(13631): RecorderThread XXXXXXXXXRECOGNIZER_LOCAL dataRead1200
...
02-13 03:45:08.630 D/SoundManager(16318): playRecognitionStopSound()


I suppose it looks like some voice command feature. How do I disable this (or at least its beeps)?
Workaround: moving away /system/priv-app/HwVAssistant.* disabled the feature.

Similar feature of pressing double volume-down => taking insta-photo persisted.