Internal sound card not recognized

[Guest]

I've got an HP Compaq 6715b running Kubuntu 14.10 which, after an update, has stopped recognizing the internal speakers. Headphones also do not work. I have tried all applicable troubleshooting procedures found in the ubuntuforums sticky concerning sound. I also tried adding options snd_intel_hda model=auto to /etc/default/alsa-base.conf to no avail. It is now commented out. I also tried the alsa-firmware tarball found in an older thread with a similar title. Kmix and Pavucontrol only list dummy speakers, and alsamixer returns cannot open mixer: No such file or directory. After using alsa-info.sh I believe I have located the problem but am having trouble finding a solution. Output of alsa-info.sh: http://pastebin.com/zLk4puep. As you can see, dmesg is outputting a lot of complaints, and I believe the problem lies with these three lines:

 [   20.469383] sound hdaudioC0D0: hda-codec: out of range cmd 0:2b54:f00:5 [   22.480066] snd_hda_intel 0000:00:14.2: no AFG or MFG node found [   22.480086] snd_hda_intel 0000:00:14.2: no codecs initialized

After a few hours of Google, I can't seem to find a fix. Can anyone help? Thanks in advance. Also, apologies for the formatting, it seems that new lines are removed by the forum software

[shigazaru]

Try doing

sudo apt-get purge alsa-base
sudo apt-get install alsa-base

that should clear out bad config.

also, I like doing

sudo apt-get install kubuntu-desktop

making sure no packages are missing from the recommended distro. it helps to fix things after you try different login manager for example, etc.