Some more info:
$ lspci -vv -s 00:1b.0
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 02)
Subsystem: Dell Unknown device 0228
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: 64 bytes
Interrupt: pin A routed to IRQ 20
Region 0: Memory at febfc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
$ cat /proc/asound/card0/codec#* | grep Codec
Codec: SigmaTel STAC9205
Codec: Conexant ID 2c06
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Microphone not detected on Dell Vostro 1500
https://bugs.launchpad.net/bugs/149423
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Bugs, which is the bug contact for Ubuntu.
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