It just happens I can do this now...
Am running kernel 3.5.0-030500rc7-generic now but it behaves just like the 
other kernels I have tried. Earlier today I raised a kernel bug report #44851 
at bugzilla.kernel.org - pointing at suspend/resume, but I think its the same 
thing.
I will do the documentation you specified.

** Tags added: kernel-bug-exists-upstream

** Description changed:

- Running 12.10, updated today, on iMac 11,2 (mid 2010) with AMD Radeon 4670. 
- Using kernel radeon driver (lsmod shows it running). 
+ Running 12.10, updated today, on iMac 11,2 (mid 2010) with AMD Radeon 4670.
+ Using kernel radeon driver (lsmod shows it running).
  Normal boot results in black screen. Ctl-Alt-Del reboots; indicating that 
system did boot.
  If I place 'nomodeset' on kernel command line, main screen can be seen and 
unity desktop runs normally.
  
  This appears to be a regression in the kernel, similar to bug 597070 (ubuntu 
11.04 - used fglrx to get video to work) and to bug 863969 (ubuntu 11.10 - 
where an upgrade to the 3.2 kernel seemed to improve video detection).
  Suspend and resume does not work either, not turning off the system, only the 
video, and resuming to a black screen.
  
  I think the problem is in KMS, because the black screen happens even if
  I boot into text mode and using nomodeset fixes it. Hence filing this
  against xorg but expect it to go to kernel developers.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: xorg 1:7.7+1ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-4.4-generic 3.5.0-rc6
  Uname: Linux 3.5.0-4-generic x86_64
  .tmp.unity.support.test.1:
-  
+ 
  ApportVersion: 2.3-0ubuntu4
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  Date: Fri Jul 13 19:12:16 2012
  DistUpgraded: Fresh install
  DistroCodename: quantal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes,
  GraphicsCard:
-  Advanced Micro Devices [AMD] nee ATI RV730 XT [Mobility Radeon HD 4670] 
[1002:9488] (prog-if 00 [VGA controller])
-    Subsystem: Apple Inc. Device [106b:00b6]
+  Advanced Micro Devices [AMD] nee ATI RV730 XT [Mobility Radeon HD 4670] 
[1002:9488] (prog-if 00 [VGA controller])
+    Subsystem: Apple Inc. Device [106b:00b6]
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120509)
  MachineType: Apple Inc. iMac11,2
  ProcEnviron:
-  LANGUAGE=en_GB:en
-  TERM=xterm
-  PATH=(custom, no user)
-  LANG=en_GB.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_GB:en
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=en_GB.UTF-8
+  SHELL=/bin/bash
  ProcKernelCmdLine: vmlinuz-3.5.0-4-generic 
root=UUID=268e7eb7-d871-478c-a906-b719eea881ea ro nosplash nomodeset 
initrd=EFI\ubuntu\initrd.img-3.5.0-4-generic
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/09/11
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM112.88Z.0057.B01.1112090906
  dmi.board.name: Mac-F2238AC8
  dmi.board.vendor: Apple Inc.
  dmi.chassis.type: 13
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F2238AC8
  dmi.modalias: 
dmi:bvnAppleInc.:bvrIM112.88Z.0057.B01.1112090906:bd12/09/11:svnAppleInc.:pniMac11,2:pvr1.0:rvnAppleInc.:rnMac-F2238AC8:rvr:cvnAppleInc.:ct13:cvrMac-F2238AC8:
  dmi.product.name: iMac11,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz 1:0.9.8+bzr3249-0ubuntu2
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.33-3
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.3-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.3-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.12.1.902-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.19.0-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.1-1build1

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

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Title:
  12.10 quantal boots to black screen on iMac

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