Disclaimer: This tutorial was written for absolute n00bs! I mean the "I've never seen a command prompt/terminal before" or "What's Ubuntu?" kinda n00b. For those experienced Linux users, my sincerest apologies. 
The initial fix for my Lenovo sound problem worked until the next reboot. When my pc booted into Ubuntu just after the fix the sound no longer worked. I've found that putting the computer on standby and waking it up revives the sound, but plugging the headphones in won't cutoff the front speakers (once again). At the end of this post I'll explain a simple way to mute the front speakers while keeping the headphones on.
- Open your terminal. This can be accomplished a number of ways, but if you have the latest Ubuntu installed you can find the terminal by going to: Applications>Accessories>Terminal (The Applications dropdown is in the upper-right hand of your screen).
- Copy this code:
sudo nano /etc/modprobe.d/alsa-base
- Now paste the code in your terminal by right-clicking in the terminal and selecting "Paste" from the dropdown menu.
- Don't try the Ctrl-c and Ctrl-v shortcuts here, it will not work.
- Once the code is pasted press your Return or Enter key.
- You will be prompted for your password. Make sure to type it slow and steady since you won't be able to see what you're typing while you type.
- Press Enter
- This should open a small editing program within the Terminal
- Now scroll down within the Terminal until you see this line of code:
# Ubuntu #62691, enable MPU for snd-cmipci
options snd-cmipci mpu_port=0x330 fm_port=0x388
- You'll have to use the arrow keys on your keyboard to navigate the cursor.
- Navigate just to the # symbol in the code
- Press Enter
- Navigate to the new blank space
- Input this code:
options snd-hda-intel model=lenovo
- The finished code towards the bottom should look something like this:
options snd-usb-caiaq index=-2
options snd-hda-intel model=lenovo
# Ubuntu #62691, enable MPU for snd-cmipci
options snd-cmipci mpu_port=0x330 fm_port=0x388- Go ahead and exit out of the terminal.
- You should be prompted to save the code, go ahead and save your changes.
- Presto frickin chango, you should be able to hear out of both your headphones and speakers!
It seems my initial sound fix was only temporary. When Ubuntu rebooted the sound appeared to be broken again.
I was fortunate enough to discover that putting my Lenovo in standby (by pressing Fn-F1) actually revived the sound. Unfortunately, the sound continued to play out of the speakers even though my headphones were plugged in.
I had to Jerry rig a solution on this one. It's not pretty, but it does the trick when you need it to:
Go to your "Applications" dropdown list and click on the Install/Uninstall option at the very bottom. Select the "Sound" option on the left to modify your search. Search for the term "Alsa mixer". Once you've found the program install it.
Using the Alsa mixer will enable you to control each sound element on your computer = you can mute the "front" while keeping your headphones on.
Ubuntu rocks...
