I have ASUS A7N8X motherboard with same audio controller. And I also hear this
background noise. Noise became noticeable in Feisty, as far as I remember.
lspci -vs 00:06.0 tells:
00:06.0 Multimedia audio controller: nVidia Corporation nForce2 AC97 Audio
Controler (MCP) (rev a1)
Subsystem: ASUSTeK Computer Inc. nForce2 AC97 Audio Controler (MCP)
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 17
I/O ports at e400 [size=256]
I/O ports at e800 [size=128]
Memory at e4001000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [44] Power Management version 2
Noise disappears, when sound is playing and laso, when CPU is high
loaded.
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sound-problem: loud background noise
https://bugs.launchpad.net/bugs/218395
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