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 : -------------------------------------------------------------------------------------------------- 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. -------------------------------------------------------------------------------------------------- I repeat it was working on Dapper so it is a regression to me in Edgy. -- Edgy : KMix and sound through headphones on laptop https://launchpad.net/bugs/66931 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs