I've eventually found solution, go to apps/google/permissions and disable the microphone.
But what if you want to record something, or have a video chat, or...do anything else that uses the microphone?
Nah, not a great solution!
This should actually
solve it, without disabling any hardware or installing unnecessary apps.
If you've already done any of the following, you can skip them--but for the sake of being thorough, I suggest stepping through all of them.
- open the Google app
- press "More..." (bottom right corner)
- select "Settings"
- select "Google Assistant"
- press the "Assistant" tab
- scroll down to the bottom
- find and select your device
- turn off "Google Assistant"
Next, and your path may vary:
System Settings | Apps & Notifications | Advanced | Default apps | Assist & voice input | Assist app | set to 'none' [or your preferred app]
That's my path on Oreo 8.0.0; another way to get there:
- in the System Settings search box, type 'assist & voice input'
- choose 'Assist app'
- set to 'none' [or preferred app]
If you give this a try, please update us with your results!