https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa
/HD-Audio.txt

you can try add hint using early patching to add Line In Jack Mode to
allow you to switch between Mic and Line In

or

send email to author to add quirk to adding  Line In jack mode only for
your cirrus 7 since it also add Headphone jack mode which allow you to
switch between Headphone and Line Out

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa
/HD-Audio.txt

- add_jack_modes (bool): add "xxx Jack Mode" enum controls to each
  I/O jack for allowing to change the headphone amp and mic bias VREF
  capabilities


http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths
/analog-input-mic-line.conf

you still need to find out how to select switch between ext mic, line in
and int mic

        ports:
                analog-input-microphone: Microfoon (priority 8700, latency 
offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-linein: Lijn-in (priority 8100, latency offset 0 
usec, available: yes)
                        properties:
                                
        active port: <analog-input-linein>

-- 
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/1216094

Title:
  [Cirrus7 Nimbus, Realtek ALC892, Pink Line In, Rear] No sound at all

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  I cannot get a microphone to work (attached to back, pink line-in). I
  hope all neccessary information is in automated attachment.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andreas    2221 F.... pulseaudio
  Date: Fri Aug 23 22:06:07 2013
  InstallationDate: Installed on 2013-07-08 (46 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH failed
  Symptom_Card: Intern geluid - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andreas    2221 F.... pulseaudio
  Symptom_Jack: Pink Line In, Rear
  Symptom_Type: No sound at all
  Title: [hostname, Realtek ALC892, Pink Line In, Rear] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/29/2013
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: KBQ7710H.86A.0051.2013.0329.1350
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DQ77KB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAG81483-500
  dmi.chassis.type: 81
  dmi.chassis.vendor: cirrus7 computing
  dmi.chassis.version: rev1
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrKBQ7710H.86A.0051.2013.0329.1350:bd03/29/2013:svncirrus7computing:pnnimbus:pvrrev1:rvnIntelCorporation:rnDQ77KB:rvrAAG81483-500:cvncirrus7computing:ct81:cvrrev1:
  dmi.product.name: nimbus
  dmi.product.version: rev1
  dmi.sys.vendor: cirrus7 computing

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