alsa and HDA Intel SigmaTel STAC9227

After upgrading my Linux, I’ve got sound lost. Everything looked ok — all the modules are loaded, all the special devices are created, no complaints in logs, — but no sound.

Everything looked like the sound was muted (switched off).

Finally, the solution in found: in “alsamixer”, the base of the bars “Master” and “Front” (and probably of some others) should contains the letters “OO” instead of the letters “MM“. From the man-page:

When a mixer control is turned off, M (mute) appears below the volume bar. When it’s turned on, O in green appears instead. You can toggle the switch via m key.

The problem is easy when you know the solution.

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