In the meantime I managed to build newer alsa modules on my system:
/proc/asound/version :
Advanced Linux Sound Architecture Driver Version 1.0.23.
Compiled on Dec 28 2011 for kernel 2.6.32-5-amd64 (SMP).
the souncard was replaced, too:
/proc/asound/cards :
0 [SB ]: HDA-Intel - HDA ATI SB
HDA ATI SB at 0xfe8f0000 irq 16
1 [CA0106 ]: CA0106 - CA0106
X-Fi Extreme Audio [SBxxxx] at 0xe800 irq 21
03:06.0 Multimedia audio controller: Creative Labs CA0106 Soundblaster
Subsystem: Creative Labs Soundblaster X-Fi Xtreme Audio
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping-
SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 64 (500ns min, 5000ns max)
Interrupt: pin A routed to IRQ 21
Region 0: I/O ports at e800 [size=32]
Capabilities: <access denied>
Kernel driver in use: CA0106
But this did not solve the problem. The crackling sounds are still there. They
are less
obstrusive when the two-pass equalizer is left off, but do not completely
vanish.
When the bass is cranked up too much, this effect even appears slightly with
the onboard
soundcard:
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
Subsystem: Biostar Microtech Int'l Corp Device 821f
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping-
SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow
>TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 64, Cache Line Size: 64 bytes
Interrupt: pin ? routed to IRQ 16
Region 0: Memory at fe8f0000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
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