Comment 4 for bug 637040

Next step for conexant would be to try different models, hopefully one of these will work. Make sure the latest drivers are installed according to the above, then edit the file /etc/modprobe.d/alsa-base.conf
and add the following line:
options snd-hda-intel model=dell-laptop
Reboot and test. Other models to test are:
thinkpad
ideapad
hp_laptop
dell-vostro
olpc-xo-1_5

Let me know which version works best for you, and please also test whether recording from different inputs are working with different models. Thanks!