Same problem observed on a new Dell Inspiron 1520 running 32-bit Feisty,
but with a twist - if the laptop has headphones (or external speakers)
plugged in when it's restarted, the headphones work, but the internal
speakers don't make any sound at all, even if the headphones are later
unplugged. "model=lenovo" didn't seem to help; the sound card is Intel
ICH8-based and uses the SigmaTel STAC9205 codec.

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Laptop speakers do not mute when using headphones
https://bugs.launchpad.net/bugs/109838
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