C-state C3 does not work after disconnecting the AC power from notebook
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Linux |
Fix Released
|
Medium
|
|||
linux (Ubuntu) |
Fix Released
|
Medium
|
Unassigned | ||
Precise |
Won't Fix
|
Medium
|
Unassigned | ||
Quantal |
Won't Fix
|
Medium
|
Unassigned |
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/
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/
Card0.Amixer.info:
Card hw:0 'VT82xx'/'HDA VIA VT82xx at 0xf5400000 irq 67'
Mixer name : 'Realtek ALC272'
Components : 'HDA:10ec0272,
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
PackageArchitec
ProcEnviron:
LANGUAGE=de_DE
TERM=xterm
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=
ProcVersionSign
RelatedPackageV
linux-
linux-
linux-firmware 1.79
Tags: precise
Uname: Linux 3.2.0-24-
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.
dmi.chassis.type: 10
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.
dmi.modalias: dmi:bvnPhoenixT
dmi.product.name: NC20/NB20
dmi.product.
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Confirmed |
Changed in linux: | |
importance: | Medium → Unknown |
status: | Confirmed → Unknown |
Changed in linux: | |
importance: | Unknown → Medium |
status: | Unknown → Incomplete |
Changed in linux: | |
status: | Incomplete → Fix Released |
apport information