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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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1252733
Title:
[XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background
noise or low volume
Status in “alsa-driver” package in Ubuntu:
Incomplete
Bug description:
When listening to sound on my laptop through headphones, there's a
constant background hiss (which disappears only when all sound has
been stopped for a few seconds. power saving I guess).
I also need to turn the volume *way* down to 10% for the sound volume
to be reasonable (it's way too loud otherwise).
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: martijn 2130 F.... pulseaudio
/dev/snd/pcmC1D0p: martijn 2130 F...m pulseaudio
/dev/snd/controlC0: martijn 2130 F.... pulseaudio
Date: Tue Nov 19 14:26:46 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-11-13 (6 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64
(20131016.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Intern geluid - HDA Intel PCH
Symptom_Jack: Black Headphone Out, Left
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: High background noise, or volume is too low
Title: [XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background
noise or low volume
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/24/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: XPS 12-9Q33
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias:
dmi:bvnDellInc.:bvrA03:bd09/24/2013:svnDellInc.:pnXPS12-9Q33:pvrA03:rvnDellInc.:rnXPS12-9Q33:rvrA03:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: XPS 12-9Q33
dmi.product.version: A03
dmi.sys.vendor: Dell Inc.
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