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["B. Bogart" <thecrap@xxxxxxx>]

With the LTS enablement stacks installed, this issue still does occur.

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https://bugs.launchpad.net/bugs/1423287

Title:
  Kernel locks up on boot sometimes after upgrade and switch from nvidia
  to nouveau driver

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  After upgrading my system to Trusty (from precise) I noticed high CPU
  loads in Xorg and render errors (Image attached). This occurred with
  all the Nvidia proprietary drivers available through "Restricted
  Drivers". This only happens on this machine with an old AGP GeForce
  Series 6 card (6600), and not on the newer machines with series 500
  and 700 nvidia pci express cards.

  After switching to Nouveau everything was fine for a while, no more
  CPU pegging from Xorg or render glitches. Then I bought a new monitor
  to replace the old CRT. So I switched from the VGA connector to the
  DVI-D connector (which I had never used before). Every once and a
  while the machine will fail to boot and hangs on the console. I've
  attached the console output when this happens as an image below.
  Compare the image to the corresponding output when the system boots
  normally:

  Feb 16 08:55:22 insitu kernel: [    8.124786] nouveau  [     DRM] DCB conn 03: 0211
  Feb 16 08:55:22 insitu kernel: [    8.124789] nouveau  [     DRM] DCB conn 04: 0213
  Feb 16 08:55:22 insitu kernel: [    8.127639] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
  Feb 16 08:55:22 insitu kernel: [    8.127647] [drm] No driver support for vblank timestamp query.
  Feb 16 08:55:22 insitu kernel: [    8.127704] nouveau  [     DRM] 0xD53B: Parsing digital output script table
  Feb 16 08:55:22 insitu kernel: [    8.177780] ata2: SATA link down (SStatus 0 SControl 300)
  Feb 16 08:55:22 insitu kernel: [    8.178050] firewire_ohci 0000:00:07.0: added OHCI v1.0 device as card 0, 4 IR + 8 IT c
  ontexts, quirks 0x11
  Feb 16 08:55:22 insitu kernel: [    8.181405] nouveau  [     DRM] MM: using M2MF for buffer copies
  Feb 16 08:55:22 insitu kernel: [    8.181426] nouveau  [     DRM] Setting dpms mode 3 on TV encoder (output 3)
  Feb 16 08:55:22 insitu kernel: [    8.238853] firewire_ohci 0000:02:0c.0: added OHCI v1.0 device as card 1, 4 IR + 4 IT c
  ontexts, quirks 0x1
  Feb 16 08:55:22 insitu kernel: [    8.244408] ata6.00: ATAPI: PIONEER DVD-RW  DVR-109, 1.40, max UDMA/66
  Feb 16 08:55:22 insitu kernel: [    8.252255] ata6.00: configured for UDMA/66
  Feb 16 08:55:22 insitu kernel: [    8.272014] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
  Feb 16 08:55:22 insitu kernel: [    8.292022] nouveau  [     DRM] Load detected on output B
  Feb 16 08:55:22 insitu kernel: [    8.292575] nouveau  [     DRM] allocated 1920x1200 fb: 0x9000, bo ffff880124132000
  Feb 16 08:55:22 insitu kernel: [    8.292754] fbcon: nouveaufb (fb0) is primary device
  Feb 16 08:55:22 insitu kernel: [    8.313245] nouveau  [     DRM] 0xD53B: Parsing digital output script table
  Feb 16 08:55:22 insitu kernel: [    8.383149] nouveau  [     DRM] Setting dpms mode 0 on TV encoder (output 3)
  Feb 16 08:55:22 insitu kernel: [    8.383164] nouveau  [     DRM] Output TV-1 is running on CRTC 1 using output B
  Feb 16 08:55:22 insitu kernel: [    8.383172] Console: switching to colour frame buffer device 90x36
  Feb 16 08:55:22 insitu kernel: [    8.383708] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device
  Feb 16 08:55:22 insitu kernel: [    8.383716] nouveau 0000:01:00.0: registered panic notifier
  Feb 16 08:55:22 insitu kernel: [    8.383728] [drm] Initialized nouveau 1.1.2 20120801 for 0000:01:00.0 on minor 0
  ...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13
  Uname: Linux 3.13.0-45-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Feb 18 08:48:04 2015
  InstallationDate: Installed on 2010-11-05 (1566 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to trusty on 2015-01-01 (48 days ago)

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