Comment 6 for bug 77427

I am having a similar problem on Hardy beta. The master volume seems mapped to the headphone output. The headphone output appears to be bass/treble or perhaps one of the 3D controls, it's hard to tell.

00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02)
        Subsystem: Dell Unknown device 017c
        Flags: bus master, medium devsel, latency 0, IRQ 17
        I/O ports at d800 [size=256]
        I/O ports at dc40 [size=64]
        Memory at f8fff800 (32-bit, non-prefetchable) [size=512]
        Memory at f8fff400 (32-bit, non-prefetchable) [size=256]
        Capabilities: <access denied>

00:1f.6 Modem: Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Modem Controller (rev 02) (prog-if 00 [Generic])
        Subsystem: Conexant Unknown device 5422
        Flags: bus master, medium devsel, latency 0, IRQ 17
        I/O ports at d400 [size=256]
        I/O ports at d080 [size=128]
        Capabilities: <access denied>

**** List of PLAYBACK Hardware Devices ****
card 0: ICH5 [Intel ICH5], device 0: Intel ICH [Intel ICH5]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: ICH5 [Intel ICH5], device 4: Intel ICH - IEC958 [Intel ICH5 - IEC958]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Modem [Intel ICH5 Modem], device 0: Intel ICH - Modem [Intel ICH5 Modem - Modem]
  Subdevices: 0/1
  Subdevice #0: subdevice #0