adding 'options snd-hda-intel model=dallas' to /etc/modprobe.d/alsa-base
solves the problem. However, the signal is weak and sound is not loud.
With the same amplifier I get 3 times louder sound with a CD player than
with the computer.
Changing the status to triaged.
** Changed in: linux (Ubuntu)
Status: Confirmed => In Progress
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ATI IXP SB4x0 HDA: headphones don't work but they do mute speakers
https://bugs.launchpad.net/bugs/215586
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