I believe the problem here lies not with wmmixer, but with oss-compat. /dev/mixer is created by the snd-mixer-oss kernel module which is one of a set that provides OSS emulation for ALSA. The oss-compat package is intended to make sure that the OSS emulation modules are loaded. However, there is currently an open bug against the package which states that a reboot is required for it to take effect:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=818220 I have verified that this does appear to be the case. Immediately after installing oss-compat the modules are not loaded, and manually running the modprobe command from the package's postinst maintainer-script doesn't do anything. Once I reboot my machine, however, the modules are loaded and /dev/mixer is present. One can, of course, manually load the OSS modules immediately after installing wmmixer: # modprobe snd-mixer-oss snd-pcm-oss I'm going to close this bug. J.
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