** Attachment added: "cpuidle information showing the problem"
https://bugs.launchpad.net/bugs/995005/+attachment/3131453/+files/cpuidle.txt
** Tags added: apport-collected precise
** Description changed:
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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https://bugs.launchpad.net/bugs/995005
Title:
C-state C3 does not work after disconnecting the AC power from
notebook
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