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[Bug 1075660] Re: Boots to corrupted/unusable screen


Parag Warudkar, could you please confirm this issue exists with the
latest development release of Ubuntu? ISO images are available from
http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains,
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

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

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

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  Boots to corrupted/unusable screen

Status in “linux” package in Ubuntu:

Bug description:
  iMac12 often boots to a corrupted / unusable screen with artifacts.
  VTs are unusable. SSH login works and killing and restarting
  Xorg/lightdm fixes the screen corruption problem.

  [ Update: Seems to be reproducible independent of kernel version -
  both -17 and -18 give the same results.]

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-17-generic 3.5.0-17.28
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
   /dev/snd/controlC1:  parag      1805 F.... pulseaudio
   /dev/snd/controlC0:  parag      1805 F.... pulseaudio
  Date: Tue Nov  6 12:33:38 2012
  HibernationDevice: RESUME=UUID=a0842c63-8b1e-47c2-8f1a-bdec366ad5bd
  InstallationDate: Installed on 2012-11-05 (1 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64+mac (20121017.3)
  MachineType: Apple Inc. iMac12,1
  MarkForUpload: True
   PATH=(custom, no user)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=0c41b65c-406b-4dc3-b100-95f28347cd76 ro quiet splash vt.handoff=7
   linux-restricted-modules-3.5.0-17-generic N/A
   linux-backports-modules-3.5.0-17-generic  N/A
   linux-firmware                            1.95
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM121.88Z.0047.B1F.1201241648
  dmi.board.name: Mac-942B5BF58194151B
  dmi.board.vendor: Apple Inc.
  dmi.chassis.type: 13
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-942B5BF58194151B
  dmi.modalias: dmi:bvnAppleInc.:bvrIM121.88Z.0047.B1F.1201241648:bd01/24/12:svnAppleInc.:pniMac12,1:pvr1.0:rvnAppleInc.:rnMac-942B5BF58194151B:rvr:cvnAppleInc.:ct13:cvrMac-942B5BF58194151B:
  dmi.product.name: iMac12,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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