sorry ... after reboot everything works quite fine although not bug-free
... forget the points B,C,X... and Y1

Z) current state after reboot is:

- additional "Soundcard elements" appeared: "Headphon", "Auto Mute",
"Mic Boos"

- volume states before/after headphone insertion are "remembered", but
not applied e.g. to the "Speaker" or "Headphon" sliders, but the
"Master" volume (e.g. Master:100%, Speaker:80% on 1. may be
Master:80%,Speaker:100% on 3.)

- muting "Speaker" or "Headphon" also mutes "Master" and this is not easily 
undone (using Gnome Alsa Mixer) so you can hear something again (exact 
behaviour somewhat unclear)
  => solution is to unmute and increase the "System Settings->Sound->Output 
Volume"

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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/871611

Title:
  [TOSHIBA NB100, Realtek ALC262, Green Headphone Out, Rear] volume
  slider problem

Status in “alsa-driver” package in Ubuntu:
  Fix Released

Bug description:
  I am using Toshiba NB100 Ubuntu Certified netbook. The sound works
  fine in general but if I plug in a jack it disappears. If I go to
  alsamixer I can see that the Speaker fader is down, so, if I move it
  up again, the sound appears in the headphones. But if I unplug the
  jack and plug it in again, the fader instantly goes down again and the
  sound disappears. This is a regression that prevents me from using
  Oneiric full time now. I've shown what happens after I plug in the
  jack on the attached screenshot.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: alsa-base 1.0.24+dfsg-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC262 Analog [ALC262 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     3092 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd0000000 irq 44'
     Mixer name : 'Realtek ALC262'
     Components : 'HDA:10ec0262,1179ff7b,00100302'
     Controls      : 17
     Simple ctrls  : 9
  CasperVersion: 1.285
  Date: Mon Oct 10 06:48:52 2011
  LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20111009)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Internal Audio - HDA Intel
  Symptom_Jack: Green Headphone Out, Rear
  Symptom_Type: Volume slider, or mixer problems
  Title: [TOSHIBA NB100, Realtek ALC262, Green Headphone Out, Rear] volume 
slider problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/15/2008
  dmi.bios.vendor: INSYDE
  dmi.bios.version: 1.10
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Base Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Insyde
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnINSYDE:bvr1.10:bd09/15/2008:svnTOSHIBA:pnTOSHIBANB100:pvrPLL10E-00Y00MRU:rvnTOSHIBA:rnPortablePC:rvrBaseBoardVersion:cvnInsyde:ct10:cvrNone:
  dmi.product.name: TOSHIBA NB100
  dmi.product.version: PLL10E-00Y00MRU
  dmi.sys.vendor: TOSHIBA

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