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[Question #78789]: alsa suddenly stopped working (dmix socket disappeared)

 

New question #78789 on alsa-lib in ubuntu:
https://answers.launchpad.net/ubuntu/+source/alsa-lib/+question/78789

Binary package hint: libasound2

Sound suddenly stopped working for me in the middle of a session (i.e. no package upgrades, no reboots, no hardware changes).  I use esd which plays through alsa, which uses dmix for mixing (the default configuration).
Playing sound through /dev/dsp works.  Applications that use ALSA fail.

If I try to run, e.g., alsaplayer on a sound file, I see

ALSA lib pcm_direct.c:224:(make_local_socket) connect failed: /tmp/alsa-dmix-31499-1171450656-848382: No such file or directory
ALSA lib pcm_dmix.c:894:(snd_pcm_dmix_open) unable to connect client
snd_pcm_open: No such file or directory (default)
Failed to initialize plugin!
Failed to register plugin: /usr/lib/alsaplayer/output/libalsa_out.so
Failed to load output plugin "alsa". Trying defaults.
ALSA lib pcm_direct.c:224:(make_local_socket) connect failed: /tmp/alsa-dmix-31499-1171450656-848382: No such file or directory
ALSA lib pcm_dmix.c:894:(snd_pcm_dmix_open) unable to connect client
snd_pcm_open: No such file or directory (default)
Failed to initialize plugin!
/usr/lib/alsaplayer/output/libalsa_out.so failed to load

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