just change the device type of pin default of four pin complex of the output 
jack from AC_JACK_SPEAKER to AC_JACK_LINE_OUT 
        


/* device device types (0x0-0xf) */
enum {
        AC_JACK_LINE_OUT,
        AC_JACK_SPEAKER,
        AC_JACK_HP_OUT,
        AC_JACK_CD,
        AC_JACK_SPDIF_OUT,
        AC_JACK_DIG_OTHER_OUT,
        AC_JACK_MODEM_LINE_SIDE,
        AC_JACK_MODEM_HAND_SIDE,
        AC_JACK_LINE_IN,
        AC_JACK_AUX,
        AC_JACK_MIC_IN,
        AC_JACK_TELEPHONY,
        AC_JACK_SPDIF_IN,
        AC_JACK_DIG_OTHER_IN, 
        AC_JACK_OTHER = 0xf,
};

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https://bugs.launchpad.net/bugs/1041322

Title:
  Very low sound on HP p7-1227c

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