On Mon, Nov 2, 2009 at 6:32 PM, petrum <petru.margin...@gmail.com> wrote:
> Not sure where the coupling is, between:

The kernel (linux) contains alsa-kernel, or the actual sound driver.
For all intents and purposes, the userspace alsa-lib is not relevant
in this specific bug. So, "ALSA" is comprised of both a kernelspace
portion (alsa-kernel) and a user-space portion (alsa-lib).

In Karmic, PulseAudio is configured by default to rely on udev, via
libudev, to provide information about which sound cards are available.
(In previous Ubuntu versions hal was used, but hal is deprecated
moving forward.) Very roughly, udev requires specifically formatted
events for linux, so changing to an older kernel version that doesn't
provide this information results in subtle bug symptoms. FWIW, you
encounter them when you see that nodes are created in /dev instead of
/dev/snd when you use Jaunty's linux with Karmic's udev.

Hope that helps.

-- 
no sound after upgrating to KK 9.10
https://bugs.launchpad.net/bugs/467747
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