Sound Lost on Carbon X1 with Kubuntu 13.10

Something is changing the sound settings automatically and sound may all of a sudden no longer be audible. This seems to happen more frequently when a monitor is connected to HDMI/DisplayPort.

I’m still not sure how to reproduce this problem exactly, and I’m also not sure how to make a workaround that will fix the problem every time it occurs. So far, however, it seems that the following may resolve the problem (temporarily):

$ pulseaudio -k
$ rm -rf .config/pulse
$ rm .cache/event-sound-cache.tdb.*
$ pulseaudio --start --log-target=syslog

Then open “Audio and Video Settings – KDE Control Center” and check the settings to make sure you use the following Audio Hardware Setup:

  • Sound card: Built-in Audio
  • Profile: Analog Stereo Duplex
  • Sound Device: Playback (Built-in Audio Analog Stereo)
  • Connector: Speakers

Hopefully, “PulseAudio Server” is now listed under “Device Preference”. Test:

  • Use the test buttons in the KDE Control Center.
  • paplay /usr/share/sounds/alsa/Front_Center.wav

I will have to do a bit more investigation before I can make a bug report that describes a 100% reproducible problem.

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