[Bug 464949] Re: Popping or clicking sound in Audigy 4

[Bob Goodwin]

I have done some research on this problem and I believe the following
info may be helpful in narrowing this problem down.

I believe the problem is related to interrupts. Creative Labs claims
they think the problem is errant bias voltages on the circuit boards but
the noise only begins as the operating system finishes loading and
starts polling devices. a bad voltage would be there whether the OS is
running or not. If you shut the system down to the BIOS menus there is
no noise.

I have played around with interrupts in the BIOS and am able to prevent
the noise by reserving the interrupt that was assigned to the board on
the previous boot-up.  For some reason, the board then gets a soft-IRQ
typically IRQ=23. In that case there is a brief flurry of pops during
the boot up and then absolutely clear sound after that no matter what
sound apps are running.

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Popping or clicking sound in Audigy 4
https://bugs.launchpad.net/bugs/464949
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