I have the same problem too. If I run gnome-volume-control from gnome-terminal 
I can see a lot of
** (gnome-volume-control:5537): WARNING **: Connection failed, reconnecting...
and the volume panel  is never displayed.

This is the output of lspci:

$ sudo lspci -v -s 00:1b.0
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio 
Controller (rev 01)
        Subsystem: Intel Corporation Device d625
        Flags: bus master, fast devsel, latency 0, IRQ 47
        Memory at f0280000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [130] Root Complex Link
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

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https://bugs.launchpad.net/bugs/762888

Title:
  No sound after upgrade to 11.04 from 10.10 - NVidia GeForce GT 430
  HDMI audio

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