This fix solves the problem for me (system beep on battery-low on Dell Mini 9): https://bugs.edge.launchpad.net/ubuntu/+source/pulseaudio/+bug/449582/comments/6
This fix solves the problem for me (system beep on battery-low on Dell Mini 9): /bugs.edge. launchpad. net/ubuntu/ +source/ pulseaudio/ +bug/449582/ comments/ 6
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