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[Chris J Arges <1107642@xxxxxxxxxxxxxxxxxx>]

@william,
Hi! What versions is this affecting you on? I know this affects quantal, but wanted to make sure this fix makes it into appropriate versions.

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https://bugs.launchpad.net/bugs/1107642

Title:
  Plymouth partly working on imac 12,1 with different results on 32bit
  and 64bit kernel

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Quantal:
  In Progress

Bug description:
  SRU Justification:

  Impact:
      When installing 32-bit images on an imac 12,1 with intel/ati graphics, there may be crashes or blank screens.

  Fix:
     bb588820ef421c6098dca1fec29c3b347f1c8c19 fixes the radeon blackout issues; this is already in raring/quantal
     9a0f938bde74bf9e50bd75c8de9e38c1787398cd fixes the i915 issues. This is in raring, but not in quantal.
     
  Testcase:
      Update kernel on install iso, and try to install 32-bit ubuntu on imac 12,1.

  
  --

  Hello,

  i have issues with plymouth on a imac 12,1.
  When starting a 64bit kernel on the imac i get a console and i can start X.

  When starting a 32bit kernel on the imac i don't get a console and i
  cannot start X.

  I have been troubleshooting this for a while now and i thought it was
  an error in the graphics driver, but that has been ruled out with the
  help of the upstream developers.

  I have then removed plymouth from the 32bit initrd (just removed the
  scripts) and my console started to work. So then i enabled
  plymouth:debug on the kernel cmd on both the 64bit kernel and the
  32bit and i was a little surprised to see that the 64bit initrdl tried
  to load the i915 driver and failed and the 32bit driver loaded the
  radeon driver and succeeded but there my console gets disabled
  somehow.

  Attached the debug logs for 64bit and 32bit plymouth debug.

  This system has a hybrid graphics setup. It contains a intel graphics card and a discrete radeon GPU (where the monitor is connected to).
  ---
  ApportVersion: 2.8-0ubuntu2
  Architecture: amd64
  DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  DistroRelease: Ubuntu 13.04
  MachineType: Apple Inc. iMac12,1
  MarkForUpload: True
  Package: plymouth 0.8.8-0ubuntu5
  PackageArchitecture: amd64
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-0-generic root=/dev/disk/by-uuid/1cf43b8b-2366-4c78-b994-e6f08ee6ea42 ro keyboard=us
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   SHELL=/bin/bash
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-0-generic root=/dev/disk/by-uuid/1cf43b8b-2366-4c78-b994-e6f08ee6ea42 ro keyboard=us
  ProcVersionSignature: Ubuntu 3.8.0-0.4-generic 3.8.0-rc3
  Tags:  raring
  TextPlymouth: Error: command ['readlink', '/etc/alternatives/text.plymouth'] failed with exit code 1:
  Uname: Linux 3.8.0-0-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  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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