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    ALSA: hda - Treat stereo-to-mono mix properly · cc261738
    Takashi Iwai 提交于
    The commit [ef403edb: ALSA: hda - Don't access stereo amps for
    mono channel widgets] fixed the handling of mono widgets in general,
    but it still misses an exceptional case: namely, a mono mixer widget
    taking a single stereo input.  In this case, it has stereo volumes
    although it's a mono widget, and thus we have to take care of both
    left and right input channels, as stated in HD-audio spec ("7.1.3
    Widget Interconnection Rules").
    
    This patch covers this missing piece by adding proper checks of stereo
    amps in both the generic parser and the proc output codes.
    Reported-by: NRaymond Yau <superquad.vortex2@gmail.com>
    Cc: <stable@vger.kernel.org>
    Signed-off-by: NTakashi Iwai <tiwai@suse.de>
    cc261738
hda_generic.c 148.3 KB