So you fix the sound:
1. Open a Terminal (Ctrl + Alt + T).
2. Write 'sudo su' to login as root.
3. Install via apt 'alsa-tools-gui'.
4. Logout via exit.
5. Write 'hdajackretask' and press enter.
6. Click on 'Intel Haswell HDMI' and select 'Realtek ALC3661'.
7. A lot of new entrys are visible. Select 'Show unconnected pins'.
8. Click on 'Overwrite' on Pin ID '0x1a'.
9. Click on the Context Menu and select 'Line out (Center/LFE)'.
10. Click on 'Apply now' and enter your user password.
11. Click on 'Install boot overwrite' to save the settings permanently.
12. Click on your Volume Icon on the top (Ubuntu Unity) and remove the
marker 'mute'.
13. Reboot and your sound work perfect.
** Also affects: alsa-base
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1332900
Title:
[Alienware 18, Realtek ALC668, Speaker, Internal] Playback problem
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https://bugs.launchpad.net/alsa-base/+bug/1332900/+subscriptions
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