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[Peter T Hayward <energonic@xxxxxxxxx>]

I cannot use ubuntu any more. Cannot burn to DVD (media not recognized). Despite following instructions to create USB install media from ubuntu iso file my iMac will not boot from it - message is 'no boot media found'.
I have successfully installed fedora 19 on my iMac, with two monitors connected; fedora boot image is recognized properly. With fedora 19 (kernel 3.11.6, radeon driver) the graphics find internal and external monitors but the names appear to be reversed. The internal monitor is named eDP and the external monitor is named DisplayPort-0. I can control the screens using xrandr.
The original problem is still there, if I suspend to RAM, and resume, the video only shows on the external monitor. This implies the radeon driver is reverting to DisplayPort-0, which, on my iMac, is the external monitor port.
So I would like to say this is confirmed, but I cannot confirm in ubuntu.

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https://bugs.launchpad.net/bugs/863969

Title:
  ubuntu 11.10b2 resumes on wrong iMac display port

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  My iMac 21.5 (11,2) has ubuntu 11.10b2 installed, dual boot with Osx Lion. Ubuntu uses the open source ATI drivers At boot the video is good: on main display, correct resolution, reasonable performance. Resuming from sleep the system switches to the external video port (nothing connected) and leaves the main screen unlit. If I plug second monitor onto the external port I can continue after resume. On external screen the X resolution is as if for the main screen (1920x1080); incorrect for external screen (should be 1280x1024). I have no way to relight the main display, except restart.
  This issue of wrong display port used to affect ubuntu booting on iMac (see #542660 & #597070) but that problem seems to have been tamed in Oneiric. However not being able to resume without a second screen is a problem, especially since the higher power consumption in Oneiric (+15w compared with OSX) means you would like to sleep when possible. From earlier discussions this seems likely to be something fairly complex in KMS code.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-3.0.0-12-generic 3.0.0-12.19
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  peter      1558 F.... pulseaudio
   /dev/snd/controlC0:  peter      1558 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xd0500000 irq 42'
     Mixer name	: 'Cirrus Logic CS4206'
     Components	: 'HDA:10134206,106b1200,00100301'
     Controls      : 22
     Simple ctrls  : 13
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xd0430000 irq 44'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100100'
     Controls      : 4
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Sat Oct  1 11:41:07 2011
  HibernationDevice: RESUME=UUID=f6e1b41a-449e-459f-8c41-f8858958eec3
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64+mac (20110816)
  MachineType: Apple Inc. iMac11,2
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=c5afd811-14a5-41cb-a001-99040b12285c ro quiet splash vt.handoff=7
  PulseSinks:
   Error: command ['pacmd', 'list-sinks'] failed with exit code 1: Home directory /home/peter not ours.
   No PulseAudio daemon running, or not running as session daemon.
  PulseSources:
   Error: command ['pacmd', 'list-sources'] failed with exit code 1: Home directory /home/peter not ours.
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.0.0-12-generic N/A
   linux-backports-modules-3.0.0-12-generic  N/A
   linux-firmware                            1.60
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/03/10
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM112.88Z.0057.B00.1005031455
  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.B00.1005031455:bd05/03/10: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.

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