Because PCI audio device enumeration is nondeterministic during boot,
either the onboard (HDA) or the peripheral (SB Live) will claim the
first audio card slot (hw:0). The root of the problem seems to be as
follows:
1) Initially hw:0 was the peripheral (SB Live) but shifted to hw:1 during some
nondeterministic sequence of subsequent boots;
2) The user's commented-out pcm.!default entries in ~/.asoundrc assumes that
hw:0 is always the peripheral (SB Live);
3) Upon the onboard (HDA) assuming hw:1, an attempt was made to recover the
peripheral as the default by issuing "asoundconf set-default-card Live" (or
some variant, including manually editing ~/.asoundrc.asoundconf);
4) The user's ~/.asoundrc.asoundconf does not have entries for duplicate
routing as in the user's original commented-out pcm.!defaults entries in
~/.asoundrc.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Converted to question:
https://answers.edge.launchpad.net/ubuntu/+source/linux/+question/70042
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sound only from 2 speakers
https://bugs.launchpad.net/bugs/370553
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