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[Ray Perigo <1024507@xxxxxxxxxxxxxxxxxx>]

Necrobumping this thing as I've been battling the same issue on an iMac
10,1 (Radeon Mobility 4670) with the most recent LTS releases. Booting
normally on 14.04 OR the most recent 16.04 nightly results in a black
screen when using the radeon driver. Interestingly, I can get display if
I plug in an external screen on the external miniDP connector (but only
on one display at a time. It will NOT display to both monitors
simultaneously).

Looking at Xorg.0.log, it can detect both DisplayPort-0 (assuming this
to be the internal DP connector for the built in panel) and eDP
(assuming this to be external DP connector), retrieves EDID, DISCONNECTS
DisplayPort-0 and then loads up using eDP. No error state reported by X,
just blank screen on the built-in panel. xrandr -d :0 -q results in
DisplayPort-0 disconnected, edP as the primary and a long list of modes
retrieved from the internal panel's EDID. It almost seems like X's wires
are crossed with these two outputs, trying to load on the external
displayport using EDID gained by initially connecting to DP0.

System is otherwise running and usable - can SSH in and fool around with
things while it's running  / restart LightDM / play with xrandr to try
and fail to make the thing work.

Listed workaround booting with nomodeset allows the system to load
graphics (slowly) over LLVMPipe on the internal display.

Other fixes tried: wily-lts kernel (4.2) , latest 4.5rc kernel available
in kernel.ubuntu.com/~kernel-ppa/mainline, updated driver/X stack for
14.04 . No effect.

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https://bugs.launchpad.net/bugs/1024507

Title:
  1002:9488 [iMac11,2] 12.10 quantal boots to black screen on iMac

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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. 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.

  WORKAROUND: Use kernel parameter nomodeset.

  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]
  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
  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

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