Comment 2 for bug 442073

The problem still exists with linux-image-2.6.31-12-generic_2.6.31-12.39_amd64.deb

Booting with acpi=off is a partial workaround: It stops at the console login and X wont start.

Maybe an ACPI problem? Attaching an acpidump.txt

The complete list of changes that lead to this issue:

linux (2.6.31-11.38) karmic; urgency=low

  [ Stefan Bader ]

  * [Upstream] acerhdf: Limit modalias matching to supported boards
    - LP: #435958

  [ Tim Gardner ]

  * [Config] Added sata_via to d-i/modules/sata-modules
    - LP: #434827
  * SAUCE: (drop after 2.6.31) Disable iwl-1000 series wireless adapters
    - LP: #439285
  * [Upstream] i915: Fix i2c init message
    - LP: #409361
  * [Config] Add sym53c8xx.ko to virtual sub-flavour
    - LP: #439415

  [ Upstream Kernel Changes ]

  * sched: Disable NEW_FAIR_SLEEPERS for now
    - LP: #436342

  * ACPI video: ignore buggy _BQC
  * ACPI video: work-around BIOS AML bug in _BQC
    - LP: #428910
  * ALSA: hda - Added quirk to enable sound on Toshiba NB200
    - LP: #438318

 -- Tim Gardner <email address hidden> Thu, 01 Oct 2009 13:52:09 -0600

linux (2.6.31-11.37) karmic; urgency=low

  [ Tim Gardner ]

  * [Config] Increase kernel log buffer to 256K for amd64 flavours
    - LP: #424810
  * [Config] Set HZ=100 for amd64 flavours
    - LP: #438234
  * [Upstream] e1000e: Emit notice instead of an error when
    pci_enable_pcie_error_reporting() fails
    - LP: #436370

  [ Upstream Kernel Changes ]

  * n_tty: honor opost flag for echoes
  * n_tty: move echoctl check and clean up logic
    - LP: #438310

  * Revert "[Upstream] drm/i915: Check that the relocation points to within
    the target" - Use upstream cherry-pick.
  * drm/i915: Check that the relocation points to within the target
    - LP: #429241

  * drm/i915: fix tiling on IGDNG
  * drm/i915: add B43 chipset support
  * agp/intel: Add B43 chipset support
    Intel request from kernel team mailing list.

  * HID: completely remove apple mightymouse from blacklist
    - LP: #428111

 -- Tim Gardner <email address hidden> Mon, 28 Sep 2009 11:47:29 -0600