I have the same issue, have had it for the last 3 releases. 4 releases
back I could fix it editing /etc/modprobe.d/alsa-base.conf  and adding
some options, but that stopped working.

I have nearly the same laptop, mine is a Satellite U405-S2856.  My
commands output the same as yours, please run these as well:

lspci -vv
lshw
aplay -l
cat /proc/asound/card0/codec#* | grep Codec

and verify that your output matches mine.

There's another guy having the same issue, check it out:
http://ubuntuforums.org/showthread.php?t=1150499


** Attachment added: "lspci-vv"
   http://launchpadlibrarian.net/48187018/lspci-vv

-- 
Microphone Issue [No signal from internal and external microphones], 
microphones not detected.
https://bugs.launchpad.net/bugs/575598
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