Please test this kernel:
https://people.canonical.com/~khfeng/lp1828669/

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https://bugs.launchpad.net/bugs/1828669

Title:
  imac 2009 24" ati radeon 4850 no screen

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  the problem is exactly the same at this post :
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/597070

  show only on minidisplay.
  main screen on if i use nomodeset.

  thanks by advence.
  Thomas

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-48-generic 4.15.0-48.51
  ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18
  Uname: Linux 4.15.0-48-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  thomas     1361 F.... pulseaudio
   /dev/snd/controlC1:  thomas     1361 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Sat May 11 13:03:11 2019
  InstallationDate: Installed on 2019-01-06 (124 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: Apple Inc. iMac9,1
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-48-generic 
root=UUID=c9d75099-dd8b-49cc-aaf7-c944c44a069b ro quiet splash radeon.modeset=1 
vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-48-generic N/A
   linux-backports-modules-4.15.0-48-generic  N/A
   linux-firmware                             1.173.5
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/27/09
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: IM91.88Z.008D.B08.0904271717
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F2218FA9
  dmi.board.vendor: Apple Inc.
  dmi.chassis.asset.tag: Asset Tag#
  dmi.chassis.type: 13
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F2218FA9
  dmi.modalias: 
dmi:bvnAppleInc.:bvrIM91.88Z.008D.B08.0904271717:bd04/27/09:svnAppleInc.:pniMac9,1:pvr1.0:rvnAppleInc.:rnMac-F2218FA9:rvr:cvnAppleInc.:ct13:cvrMac-F2218FA9:
  dmi.product.family: Mac
  dmi.product.name: iMac9,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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