installing linux-backports-modules-alsa-$(uname -r) did not fixed this
bug, the left channel is still scratchy. Sorry for the useless apport
attachments, it usually attaches useful stuff.

I'm on a MacBook 2,1


00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition 
Audio Controller (rev 02)
        Subsystem: SigmaTel Device 7680
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 256 bytes
        Interrupt: pin A routed to IRQ 27
        Region 0: Memory at d0440000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

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Static sound on Left Channel with hda-intel STAC 9221 A1
https://bugs.launchpad.net/bugs/266927
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