I had the same problem in Ubuntu Lucid on a Sony VAIO VPCEB1M1E.
I've run hda-analyzer, and under Node[0x19] PIN, changed Widget Control
VREF from 80 to HIZ. Problem solved, sound restored.
However, running hda-analyzer and clicking through that every time is
somewhat laborious, so I've downloaded the hda-verb utility, compiled
it, and added a script to rc.local to invoke it this way:
/PATH/TO/hda-verb /dev/snd/hwC0D0 0x19 SET_PIN_WIDGET_CONTROL 0x60
0x60 is the code for the constant VREF_HIZ.
** Changed in: alsa-driver (Ubuntu)
Status: Incomplete => Confirmed
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[Realtek ALC269 ]No sound on Sony Vaio VPCEB1j1e Lucid Alpha3
https://bugs.launchpad.net/bugs/534372
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