[Bug 551441] [NEW] No sound on internal speakers on June 2009 MacBook Pro

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I just upgraded my June 2009 MacBook Pro from Karmic to Lucid.  My sound
card is now recognized, and analog headphones work, but the internal
speakers still don't.

lspci output:

00:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio (rev b1)
        Subsystem: nVidia Corporation Device cb79
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0 (500ns min, 1250ns max)
        Interrupt: pin A routed to IRQ 20
        Region 0: Memory at d3580000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: lucid-upgrade-testing
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No sound on internal speakers on June 2009 MacBook Pro
https://bugs.launchpad.net/bugs/551441
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