Hmm, this might be one of Realtek's processing coefficient magic bugs.
You were saying it works from a fresh install. Does this mean it also
works from a live-CD? If it does, could you please boot a live-CD,
confirm that sound works, and then post an
https://wiki.ubuntu.com/Audio/AlsaInfo from there? Thanks!
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/714875
Title:
[Realtek ALC259] ALSA test tone not correctly played back. Sound works
on Win7 with laptop speakers, sound works on Ubuntu 10.10 with
headphones, but not with laptop speakers
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