Even if that's the case, it's not really relevant. If the concern is that an attacker will listen your mic, the only 100% solution is to physically extricate the mic from your laptop. If an attacker is able to install software (with administrative privilege) on your computer, they can do anything you can do, including re-configure your audio devices and mic volume levels.
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Even if that's the case, it's not really relevant. If the concern is that an attacker will listen your mic, the only 100% solution is to physically extricate the mic from your laptop. If an attacker is able to install software (with administrative privilege) on your computer, they can do anything you can do, including re-configure your audio devices and mic volume levels.