Public bug reported:

When booting (after kernel selection in grub2) the system is freezed.
The screen became black and system seems freezed, but keyboard responds.
Pressing Ctrl+Alt+F1 followed by Ctrl+Alt+F7 a stack dump will be
showed. Please refer to the dmesg_from_boot_to_stack_dump.log for more
informations.

The PC is an Acer TimeLineX 4820TG
Ubuntu version is Natty Beta2 64 bits

Problem is reproducible :
1/ WithOUT power supply cable plugged, power on the Acer TimeLineX 4820TG under 
Ubuntu Natty Beta2 64 bits
2/ Under the grub kernel selection, choose 2.6.38-8
3/ Login and choose shutdown
4/ After PLUG the power supply cable and switch on the laptop
5/ Under the grub kernel selection, choose 2.6.38-8
6/ The system will freeze some seconds later
7/ Pressing Ctrl+Alt+F1 followed by Ctrl+Alt+F7 show a stack dump.
8/ Unplug the power cable, press Alt+Syst+B to reboot. Problem will not happen

Please note that at point 1/ if you switch on the machine with the power
supply cable plugged, and at point 4/ unplug it, the problem will also
happen!


Feel free to contact me in order to make further test. It's a regression, the 
problem doesn't happen under the 2.6.38-7 kernel.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC271X Analog [ALC271X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  marmotte   1584 F.... pulseaudio
 /dev/snd/pcmC0D0p:   marmotte   1584 F...m pulseaudio
CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdc500000 irq 45'
   Mixer name   : 'Realtek ALC271X'
   Components   : 'HDA:10ec0269,10250359,00100100'
   Controls      : 18
   Simple ctrls  : 10
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xdc420000 irq 46'
   Mixer name   : 'ATI R6xx HDMI'
   Components   : 'HDA:1002aa01,00aa0100,00100200'
   Controls      : 4
   Simple ctrls  : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Mon Apr 18 23:13:47 2011
HibernationDevice: RESUME=UUID=75d91426-30a5-4061-a210-0b4e39f9afd2
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
Lsusb:
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 004: ID 064e:a219 Suyin Corp. 
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Aspire 4820TG
ProcEnviron:
 LANGUAGE=fr:en
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic 
root=UUID=0ee4047a-e5c0-4236-93bf-947913d3a984 ro quiet splash acpi_osi=Linux 
vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic  N/A
 linux-firmware                            1.50
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/16/2011
dmi.bios.vendor: INSYDE
dmi.bios.version: V1.25
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: JM41_CP
dmi.board.vendor: Acer
dmi.board.version: Base Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnINSYDE:bvrV1.25:bd03/16/2011:svnAcer:pnAspire4820TG:pvrV1.25:rvnAcer:rnJM41_CP:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.name: Aspire 4820TG
dmi.product.version: V1.25
dmi.sys.vendor: Acer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kernel-graphics natty needs-upstream-testing 
regression-release running-unity

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https://bugs.launchpad.net/bugs/765216

Title:
  system freeze while booting if power conditions are not the same as at
  the shutdown

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