@ stefan. Did you try to deactivate nvidia drivers and thus using nouveau drivers? This made my system stable as far as I can tell.

Hein
Verzonden vanaf mijn BlackBerry®-toestel

-----Original Message-----
From: Stefan Leitner <email address hidden>
Sender: <email address hidden>
Date: Fri, 31 Aug 2012 12:01:49 
To: <email address hidden>
Reply-to: Bug 1033263 <email address hidden>
Subject: [Bug 1033263] Re: Ubuntu 12.04 freezes with nvidia drivers

So after 13 hours and about 45 minutes it the system hung up again, all
frozen expect mouse movement - i could connect to my PC and added dmesg
(and lspci and uname -a) to this attachment...

hope it helps someone to find the problem...

** Attachment added: "dmesg after freeze with nvidia driver"
   https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/1033263/+attachment/3285629/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1033263

Title:
  Ubuntu 12.04 freezes with nvidia drivers

Status in “nvidia-graphics-drivers” package in Ubuntu:
  Confirmed

Bug description:
  After activiting Nvidia drivers complete freezes (only hard reset
  works). Mouse cursor moves, all else seems to come to an instant halt.

  Hardware: Acer Aspire 7520, Geforce 8400m G (shared memory).

  (Re)installing Nouveau drivers 'solves' the problem. Newer Nvidia
  drivers from PPA unsucceslful as well (same problem).

  Laptop works like a charm with 11.10 and nvidia drivers.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-27-generic 3.2.0-27.43
  ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
  Uname: Linux 3.2.0-27-generic x86_64
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  hein       1932 F.... pulseaudio
  CRDA:
   country NL:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20), NO-OUTDOOR
   	(5250 - 5330 @ 40), (N/A, 20), NO-OUTDOOR, DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Card0.Amixer.info:
   Card hw:0 'NVidia'/'HDA NVidia at 0xf0880000 irq 21'
     Mixer name	: 'Realtek ALC268'
     Components	: 'HDA:10ec0268,10250126,00100003 HDA:14f12c06,10250126,00100000'
     Controls      : 26
     Simple ctrls  : 14
  Date: Sun Aug  5 20:48:28 2012
  HibernationDevice: RESUME=UUID=8ec5ad0a-4378-4d68-a4d4-d35c9b66570e
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: Acer Aspire 7520
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=nl_NL.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic root=UUID=613ca040-8bae-4af8-8b6a-33d7d98e49a7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-27-generic N/A
   linux-backports-modules-3.2.0-27-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/12/2007
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.05
  dmi.board.name: Fuquene
  dmi.board.vendor: Acer
  dmi.board.version: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAcer:bvrV1.05:bd07/12/2007:svnAcer:pnAspire7520:pvrV1.05:rvnAcer:rnFuquene:rvrN/A:cvnAcer:ct10:cvrN/A:
  dmi.product.name: Aspire 7520
  dmi.product.version: V1.05
  dmi.sys.vendor: Acer

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