I have the same problem with a Dell Vostro v131. Worked in 12.10, but
not 13.04.
luciano@v131:~$ sudo lspci -v | grep -A7 -i "audio"
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family
High Definition Audio Controller (rev 05)
Subsystem: Dell Device 0510
Flags: bus master, fast devsel, latency 0, IRQ 51
Memory at f7f00000 (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
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset
Family PCI Express Root Port 1 (rev b5) (prog-if 00 [Normal decode])
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https://bugs.launchpad.net/bugs/1127699
Title:
Internal microphone does not working in Dell 3420 with Ubuntu Raring
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