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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1559051

Title:
  Instable DisplayPort with latest radeon driver

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm using an external monitor on my notebook via DisplayPort => DVI
  adapter.

  After the latest Xenial updates, which included a kernel update to
  4.4.0-13.29, I had massive problems, with black screen after reboot to
  black screen after suspend with the attached monitor.

  xrandr still showed the monitor correctly. Additionally I had graphic
  glitches. Sometimes I managed to re-enable the monitor by detaching
  it, changing some window in the KDE session and re-attaching it. But
  it didn't always work. dmesg had some entries like:

  [drm:radeon_dp_link_train [radeon]] *ERROR* displayport link status
  failed

  The 12.27 kernel contained a "Pull in upstream AMD code (amdgpu) in
  Xenial (LP: #1546572)", which also includes "drm/radeon: fix dp link
  rate selection (v2)" patch

  So I took the old radeon modules source from 11.26, compiled and
  installed it for 13.29, updated the initramfs and my problems are
  solved.

  I didn't yet test the explicit patch. as I don't know where the
  patchset was taken from.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-13-generic 4.4.0-13.29
  ProcVersionSignature: Ubuntu 4.4.0-13.29-generic 4.4.5
  Uname: Linux 4.4.0-13-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jmg        3642 F.... pulseaudio
   /dev/snd/controlC1:  jmg        3642 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Mar 18 12:34:15 2016
  HibernationDevice: RESUME=UUID=9e7dddd0-bcd1-4a58-b700-4b47774178d3
  MachineType: LENOVO 2550W4R
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-13-generic root=/dev/mapper/lenovo--username-root ro splash quiet radeon.dpm=1 nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-13-generic N/A
   linux-backports-modules-4.4.0-13-generic  N/A
   linux-firmware                            1.156
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-03-04 (13 days ago)
  dmi.bios.date: 09/21/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 81ET44WW (1.20 )
  dmi.board.name: 2550W4R
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr81ET44WW(1.20):bd09/21/2010:svnLENOVO:pn2550W4R:pvrThinkPadL512:rvnLENOVO:rn2550W4R:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2550W4R
  dmi.product.version: ThinkPad L512
  dmi.sys.vendor: LENOVO

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