Dlizzz, thank you for reporting this and helping make Ubuntu better. Maverick 
reached EOL on April 10, 2012.
Please see this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We were wondering if this is still an issue in a supported release? If
so, could you please test for this with the latest development release
of Ubuntu? ISO CD images are available from
http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you please run the following command in
the development release from a Terminal
(Applications->Accessories->Terminal), as it will automatically gather
and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following 
https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional 
upstream developers to examine the issue. Please do not test the kernel in the 
daily folder, but the one all the way at the bottom. Once you've tested the 
upstream kernel, please comment on which kernel version specifically you tested 
and remove the tag:
needs-upstream-testing

This can be done by clicking on the yellow pencil icon next to the tag located 
at the bottom of the bug description and deleting the text:
needs-upstream-testing

If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested.

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested.

If you are unable to test the mainline kernel, please comment as to why 
specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested.

Please let us know your results. Thank you for your understanding.

Helpful Bug Reporting Tips:
https://help.ubuntu.com/community/ReportingBugs

** Description changed:

  The kernel crashes not long after it has booted. It's always the case when I 
boot in X mode (no time to login), but it isn't always the case when I boot in 
text mode.
  The previous version of Ubuntu (10.04) is running fine on the same machine. 
I'm able to boot the 10.10 version, without any problem, with the mainline 
kernel 2.6.34-02063407-generic amd64
+ 
+ WORKAROUND: So I've rebooted the 2.6.35-28 kernel with the
+ "intel_idle.max_cstate=0" parameter on the command line and everything
+ went fine.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-28-generic 2.6.35-28.49
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.35-28.49-generic 2.6.35.11
  Uname: Linux 2.6.35-28-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  matou      2065 F.... pulseaudio
   /dev/snd/pcmC0D0c:   matou      2065 F...m pulseaudio
   /dev/snd/pcmC0D0p:   matou      2065 F...m pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf7ff8000 irq 73'
     Mixer name : 'Realtek ALC1200'
     Components : 'HDA:10ec0888,104383c0,00100101'
     Controls      : 35
     Simple ctrls  : 20
  Date: Sat Apr  2 18:21:44 2011
  HibernationDevice: RESUME=UUID=bef0dc46-f93c-4db8-9233-99fa48f6e4b0
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 
(20100816.1)
  IwConfig:
   lo        no wireless extensions.
  
   eth0      no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-28-generic 
root=UUID=4c1c9b0d-cb44-4703-830d-381af17ec332 ro text
  ProcEnviron:
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.38.5
  RfKill:
  
  SourcePackage: linux
  dmi.bios.date: 03/08/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1303
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1303:bd03/08/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6T:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/748420

Title:
  2.6.35-28-generic amd64 kernel crash @ boottime

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