Consider following case

I am listening to music on xfce 4.12. The sound level is on 25% of the maximum in ALSA Mixer. Suddenly, an application [I reproduced it using two different applications] gives a loud warning sound. I open ALSA Mixer, and it seems that the sound level has automatically been set to 100%.

After this incident, I manually put the sound level on 25%, but cannot hear the music anymore. If I set it to 100%, I hear a sound level that corresponds to what used to be 25% before the incident.

What did happen? Is it possible to prevent this from happening again (in order to save your ears)?


  • The installed ALSA version is k4.9.0-5-amd64 (see this question).

  • This happened for instance while listening to music on 25%. I downloaded a file and opened it in Okular. The sound level was set to 100% and a warning (with sound) told me that Okular could not open the file.

  • It happened again in Konqueror when it opened an error

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