I am also suffering this problem (both no microphone and low speaker
volume compared to Windows). A slightly more complete lspci dump
follows. Thanks!

$ sudo lspci -vv -s 00:1b.0
Password:
0000:00:1b.0 0403: Intel Corporation 82801G (ICH7 Family) High Definition Audio 
Controller (rev 02)
        Subsystem: Toshiba America Info Systems: Unknown device 0001
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 0x08 (32 bytes)
        Interrupt: pin A routed to IRQ 66
        Region 0: Memory at 35080000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA 
PME(D0+,D1-,D2-,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [60] Message Signalled Interrupts: 64bit+ Queue=0/0 
Enable-
                Address: 0000000000000000  Data: 0000
        Capabilities: [70] #10 [0091]

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my microphone doesn't work in my Intel Corporation 82801G (ICH7 Family) 
https://launchpad.net/bugs/58128

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