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[Julian Wiedmann <995005@xxxxxxxxxxxxxxxxxx>]

Merged during the raring cycle, but the second patch is still missing in
Precise/Quantal.

** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

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Title:
  C-state C3 does not work after disconnecting the AC power from
  notebook

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Precise:
  Triaged
Status in “linux” source package in Quantal:
  Triaged

Bug description:
  On my Samsung NC20 Netbook the BIOS hides the C3 C-state when the AC
  power is connected, but it should show up and work as soon as the AC
  power is disconnected.

  This expected behavior worked fine as long as I used Oneiric. But now
  I upgraded to Precise and now C3 does not work anymore after
  disconnecting the AC power.

  I have verified, that booting the Oneiric kernel 3.0.0-19.33 instead
  of the Precise Kernel 3.2.0-24.37 (same userspace) fixes the problem.

  To gather some information, I executed this command with the Precise kernel
    grep -r "" /sys/devices/system/cpu/cpu0/cpuidle/
  in different system states:
  1. newly booted without having the AC power attached
  2. having the AC power attached (without C3, as expected)
  3. now after having the AC power disconnected (not functional C3 --> bug)

  The output is combined in the attached file "cpuidle.txt".
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: VT82xx [HDA VIA VT82xx], device 0: ALC272 Analog [ALC272 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: VT82xx [HDA VIA VT82xx], device 0: ALC272 Analog [ALC272 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  schlicht   2920 F.... kded4
                        schlicht   3190 F.... kmix
  Card0.Amixer.info:
   Card hw:0 'VT82xx'/'HDA VIA VT82xx at 0xf5400000 irq 67'
     Mixer name	: 'Realtek ALC272'
     Components	: 'HDA:10ec0272,144dc04e,00100001'
     Controls      : 18
     Simple ctrls  : 10
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=/dev/sda6
  MachineType: SAMSUNG ELECTRONICS CO., LTD. NC20/NB20
  Package: linux 3.2.0.24.26
  PackageArchitecture: i386
  ProcEnviron:
   LANGUAGE=de_DE
   TERM=xterm
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic-pae root=UUID=28a00041-0781-44a2-8a24-684926bf9ea9 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-24-generic-pae N/A
   linux-backports-modules-3.2.0-24-generic-pae  N/A
   linux-firmware                                1.79
  Tags:  precise
  Uname: Linux 3.2.0-24-generic-pae i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 11/25/2009
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 10MQ
  dmi.board.name: NC20/NB20
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr10MQ:bd11/25/2009:svnSAMSUNGELECTRONICSCO.,LTD.:pnNC20/NB20:pvr04MQ:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNC20/NB20:rvr:cvnSAMSUNGELECTRONICSCO.,LTD.:ct10:cvrN/A:
  dmi.product.name: NC20/NB20
  dmi.product.version: 04MQ
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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