[Bugme-new] [Bug 13633] New: [bisected] No sound on HDA Intel (ALC268)

[bugzilla-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=13633

           Summary: [bisected] No sound on HDA Intel (ALC268)
           Product: Drivers
           Version: 2.5
    Kernel Version: v2.6.31-rc1-114-g4075ea8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Sound(ALSA)
        AssignedTo: perex at perex.cz
        ReportedBy: brian at xyzw.org
                CC: tiwai at suse.de
        Regression: No


With a recent kernel, my laptop no longer produces sound from the speakers or
the headphone jack. I have made sure all mixer controls are turned up and
unmuted. I bisected the problem to the following commit:

commit 4a79ba34cada6a5a4ee86ed53aa8a73ba1e6fc51
Author: Takashi Iwai <tiwai at suse.de>
Date:   Wed Apr 22 16:31:35 2009 +0200

    ALSA: hda - Add amp initialization for realtek auto mode

    In the realtek auto-probing mode, the initialization of amp with
    some magic COEF or EAPD verbs is applied only when the codec SSID
    has valid values to satisfy the realtek's definition.
    However, many devices don't provide in that way, thus the device
    doesn't work as is.

    This patch allows the same initialization code even if the SSID
    doesn't pass the bit test.  Also, alc_subsystem_id() is changed
    just to check and define the type, so that it's called in the
    parser, instead of the initializer.

    Signed-off-by: Takashi Iwai <tiwai at suse.de>

Here is my audio device:
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller [8086:284b] (rev 03)

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