the fix didn't work for me on a Toshiba T115D-S1125 running lucid.
$ lspci -v | less
01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller
Subsystem: ATI Technologies Inc Device 9612
Flags: bus master, fast devsel, latency 0, IRQ 28
Memory at cfdec000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
$ cat /proc/asound/card0/codec#* | grep Codec
Codec: Conexant CX20582 (Pebble)
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[Conexant CX20582 (Pebble)] Playback problem - sound from speakers when
headphones plugged in, or both in headphones and speakers
https://bugs.launchpad.net/bugs/549289
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