“测试”不在20.04上进行测试

In the sound setting in gnome-settings, there's a test button just next to the Output Device selection. Pressing this button will show up something like "front left" or "front right", which are supposed to make some noise on the corresponding speaker.

但是,无论我选择哪种输出设备,这些按钮在Ubuntu 20.04上都无能为力。而且,当然,我尝试过的所有输出设备都可以与其他软件(例如浏览器,音乐播放器等)完美配合。其他系统警报声音也可以正常工作。

Is it purely a bug in gnome-settings? Or is my system missing something?

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