http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/sound/pci/hda/patch_realtek.c?id=5e6db6699b7651f02f4b7cc6a86f5b3d9359d636
you lost the beep playback volume / switch if you disable the loopback
mixer
the topology of realtek codecs are different from other hda codec,
the loopback mixer don't have mute switch to mute its output to output pins
the driver need to examine the mixers in output paths of those output pins and
this loopback mixer to mute
the connection from this loopback mixer 0x0b
Node 0x0c [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-In vals: [0x00 0x00] [0x00 0x00]
Connection: 2
0x02 0x0b
Node 0x0d [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-In vals: [0x00 0x00] [0x00 0x00]
Connection: 2
0x03 0x0b
Node 0x0e [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
Amp-In vals: [0x00 0x00] [0x80 0x80]
Connection: 2
0x04 0x0b
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https://bugs.launchpad.net/bugs/1252733
Title:
[XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background
noise or low volume
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