I have the same whistle, but the fix mentioned above (default-sample-
format = s24le) doesn't work. A temporary solution that I found is just
to open "Sound Preferences" window every time I log in. It is funny but
the whistle disappears while the window is open and comes back when it
is closed. Do you know more cleaver solution?

Here are audio settings:

Distributor ID: Ubuntu
Description:    Ubuntu 9.10
Release:        9.10
Codename:       karmic

00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio 
Controller [8086:284b] (rev 03)
        Subsystem: Toshiba America Info Systems Device [1179:ff00]
        Flags: bus master, fast devsel, latency 0, IRQ 31
        Memory at f4700000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

-- 
after upgrade to karmic during audio playback a high-frequency whistling can be 
heard
https://bugs.launchpad.net/bugs/475997
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