Comment 1 for bug 66931

I finally went throught th problem by myself using "ac97_quirk" parameter.

Edit ALSA conf : kdesu kate /etc/modprobe.d/alsa-base
Add the line : options snd-intel8x0 ac97_quirk=1

Infos on "ac97_quirk" parameter :
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    Below is quoted from the document included in the kernel-source.

    Module snd-intel8x0
    -------------------

    Module for AC'97 motherboards from Intel and compatibles.
    * Intel i810/810E, i815, i820, i830, i84x, MX440
    * SiS 7012 (SiS 735)
    * NVidia NForce, NForce2
    * AMD AMD768, AMD8111
    * ALi m5455

    ac97_clock - AC'97 codec clock base (0 = auto-detect)
    ac97_quirk - AC'97 workaround for strange hardware

    The following strings are accepted:
    default = don't override the default setting
    disable = disable the quirk
    hp_only = use headphone control as master
    swap_hp = swap headphone and master controls
    swap_surround = swap master and surround controls
    ad_sharing = for AD1985, turn on OMS bit and use headphone
    alc_jack = for ALC65x, turn on the jack sense mode
    inv_eapd = inverted EAPD implementation
    mute_led = bind EAPD bit for turning on/off mute LED
    For backward compatibility, the corresponding integer
    value -1, 0, ... are accepted, too.
    buggy_irq - Enable workaround for buggy interrupts on some
    motherboards (default off)

    Module supports autoprobe and multiple bus-master chips (max 8).

    Note: the latest driver supports auto-detection of chip clock.
    if you still encounter too fast playback, specify the clock
    explicitly via the module option "ac97_clock=41194".

    Joystick/MIDI ports are not supported by this driver. If your
    motherboard has these devices, use the ns558 or snd-mpu401
    modules, respectively.

    The ac97_quirk option is used to enable/override the workaround
    for specific devices. Some hardware have swapped output pins
    between Master and Headphone, or Surround. The driver provides
    the auto-detection of known problematic devices, but some might
    be unknown or wrongly detected. In such a case, pass the proper
    value with this option.

    The power-management is supported.
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I repeat it was working on Dapper so it is a regression to me in Edgy.