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I've installed Slack 12.2 onto a HP 6730s laptop (all packages for simplicity) with an integrated Intel HD audio in it. I have no sound. I've tried the above mentioned tricks and some other without any success. E.g. I've reinstalled a/devs-xxx.tgz in order to have /dev/dsp0 etc. After I had reinstalled the package I had /dev/dsp0, /dev/dsp as a symlink etc. There were no sound at all. After a reboot I noticed that the reinstalled devices disappeared. (!???)
lsmod says that there are a large number of snd modules are loaded.
alsaconf, alsactl etc. seems to work correrctly, Master, Headphone, PCM is on.
Neiter aplay nor mpg123 can produce a hearable sound.
I have /dev/dsp and /dev/mixer (at least after re-installing alsa-lib and alsa-drivers):
crw-rw---- 1 root audio 14, 3 2009-07-21 18:04 /dev/dsp
crw-rw---- 1 root audio 14, 0 2009-07-21 18:04 /dev/mixer