[alsa-devel] poor sound from ALC 850/880 in alsa 1.0.21 and 1.0.23

Raymond Yau superquad.vortex2 at gmail.com
Mon Nov 29 08:40:55 CET 2010

2010/11/28 Colin Kincaid Williams <discord at uw.edu>

> no, the motherboard has 6 plugs, but no digital outputs on the back.
> Furthermore, I muted the CD channel, the line in was already muted,
> but I still have crap sound compared to my $20 mp3 player. Something
> else is wrong!
Take a look at the block diagram of alc880 datasheet

does it help when you use hda-analyzer to mute the amp-in value from node
0x0b in 0x0c ?

Node 0x0c [Audio Mixer] wcaps 0x20010f: Stereo Amp-In Amp-Out
  Control: name="Front Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x00 0x00]
  Amp-Out caps: ofs=0x40, nsteps=0x40, stepsize=0x03, mute=0
  Amp-Out vals:  [0x33 0x33]
  Connection: 2
     0x02 0x0b

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