Crackling / bad sound on nVidia Corporation MCP51 High Definition Audio (SOLVED)

[daballiemo]

Hi all,

I have had a problem with my motherboard that when I used UI2 my sound was very bad. It sounded like crackling and with a bit of an echo. Using the most simple UI I did not have the problem.

My solution:

Check your type of soundcard via lspci...

Then find your soundcard in the next file

linuxmce@dcerouter:~$ zless /usr/share/doc/alsa-base/driver/ALSA-Configuration.txt.gz

For my specific card is says:

<cut>

 Module snd-hda-intel
  --------------------

    Module for Intel HD Audio (ICH6, ICH6M, ESB2, ICH7, ICH8),
                ATI SB450, SB600, RS600,
                VIA VT8251/VT8237A,
                SIS966, ULI M5461

    model       - force the model name
    position_fix - Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO siz
e)
    probe_mask  - Bitmask to probe codecs (default = -1, meaning all slots)
    single_cmd  - Use single immediate commands to communicate with
                codecs (for debugging only)
    enable_msi  - Enable Message Signaled Interrupt (MSI) (default = off)

    This module supports one card and autoprobe.

    Each codec may have a model table for different configurations.
    If your machine isn't listed there, the default (usually minimal)
    configuration is set up.  You can pass "model=<name>" option to
    specify a certain model in such a case.  There are different
    models depending on the codec chip.

          Model name    Description
          ----------    -----------
        ALC880
          3stack        3-jack in back and a headphone out
          3stack-digout 3-jack in back, a HP out and a SPDIF out
          5stack        5-jack in back, 2-jack in front
          5stack-digout 5-jack in back, 2-jack in front, a SPDIF out
          6stack        6-jack in back, 2-jack in front
          6stack-digout 6-jack with a SPDIF out
          w810          3-jack
          z71v          3-jack (HP shared SPDIF)
          asus          3-jack (ASUS Mobo)
          asus-w1v      ASUS W1V
          asus-dig      ASUS with SPDIF out
          asus-dig2     ASUS with SPDIF out (using GPIO2)
          uniwill       3-jack
          fujitsu       Fujitsu Laptops (Pi1536)
          F1734         2-jack

</cut>


Adding "options snd-hda-intel position_fix=1 model=3stack" at the end of /etc/modprobe.d/alsa-base solved my problem after a reboot of the MD.

Maybe somebody is helped with this...


(original link: http://www.lucagasperini.com/blog/2007-laptop-sound-working/)