4

There is a red light turned on (it seems an infrared light or optical sound) when I boot Ubuntu, and it remains always on, but not when I boot MacOS in a MacBook Pro. How can I save energy with Ubuntu as much as with MacOS and have it turned off? Also, bluetooth should always be turned off at boot time, unless you configure it to be on.

Braiam
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Robert
  • 131

1 Answers1

5

Mute the "S/PDIF" control in alsamixer and then run sudo alsactl store to make this persist across reboots.

bgamari
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