As far as I can tell, it made no difference; but I cannot be certain it
did nothing, as I haven't been able to get audio working for the past
week or so (except for one instance). But correct if I am wrong, but
isn't PulseAudio is a sound server with an Alsa (default in Ubuntu)
backend, with backend being responsible for detecting and managing
hardware?

Anyway: kudos, you gave me the first new thing to try since I begun
scouring the web trying to get it to work.

I have a couple other symptoms that may or may not help:
1) the times when I got the card to be detected (but not work) during boot, 
there are now two entries in boot.log instead of one:
 * Starting System V runlevel compatibility[ OK ]

 * Starting restore sound card(s') mixer state(s)[ OK ]

[...]
 * Starting deferred execution scheduler[ OK ]

 * Starting restore sound card(s') mixer
state(s)[fail]


2) When the card fails to work on boot, there is no entry in 
/sys/devices/pci0000:00/ for the PCI address of the sound card (0000:00:07.0 in 
my case, as the attachments above show).

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https://bugs.launchpad.net/bugs/779983

Title:
  [Natty] Unreliable detection of snd-hda-intel with Conexant CX20549
  codec

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