[ubuntu] Loud Beep on speakers when rebooting/shutdown

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http://ubuntuforums.org – After upgrading to 12.10, i'm getting a loud beep when shutting down or restarting my HP 2560p laptop. Sound comes through speakers and/or headphones. This happens on unity and gnome DE. hwinfo --sound shows the following: Code: 12: PCI 1b.0: 0403 Audio device                                  [Created at pci.318]   Unique ID: u1Nb.kZ5ZvXzaJL4   SysFS ID: /devices/pci0000:00/0000:00:1b.0   SysFS BusID: 0000:00:1b.0   Hardware Class: sound   Model: "Intel Audio device&quot (Hardware)