In case it's interesting, the audio-related section of lspci:
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition
Audio Controller (rev 01)
Subsystem: Dell Unknown device 01c2
Flags: bus master, fast devsel, latency 0, IRQ 20
Memory at efebc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0
Enable-
Capabilities: [70] Express Unknown type IRQ 0
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volume buttons control PCM instead of Master volume
https://launchpad.net/bugs/97530
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