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On 2019-03-19T06:49:42+00:00 Timo Aaltonen wrote:

This bug is filed to monitor the progress on getting this patchset

one use case for it is to be able to set up a 3x4k horizontal monitor
configuration for X.

Reply at:

** Changed in: dri
       Status: Unknown => Confirmed

** Changed in: dri
   Importance: Unknown => Medium

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  Triple 4K monitor display failed (modesetting driver limited to

Status in DRI:
Status in X.Org X server:
Status in linux package in Ubuntu:
Status in mesa package in Ubuntu:
  Fix Released
Status in xorg-server package in Ubuntu:
Status in linux source package in Bionic:
Status in mesa source package in Bionic:
  Fix Released
Status in xorg-server source package in Bionic:

Bug description:
  Title: Triple monitor display failed with Dell Dock (HiDPI)

  Summary: Triple monitor display failed with Dell Dock (HiDPI)

  1. a laptop with Built-in 4K LCD
  2. Cold boot system with Dell Dock connected
  3. Connect a 4K monitor to Dock
  4. Connect 2nd 4K monitor to Dock
  5. Go to [All Settings]=>[Displays] to have the following configuration.
  Resolution: 4kx2k@60Hz (one Built-in LCD + two external monitors)
  Mirror displays: disable

  Expected results: Triple monitor display should works without issues
  Actual results: Triple monitor display failed with Dell Dock

  Additional information:
  1. Linux distribution: Ubuntu 16.04+modesetting, 16.04.3, and 17.04
  2. Laptop: Dell Precision 5520
  3. Dell Business Thunderbolt Dock - TB16

  Log in to "Ubuntu on Wayland" instead of "Ubuntu".


  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  DistUpgraded: Fresh install
   # This is a distribution channel descriptor
   # For more information see
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
   Intel Corporation Device [8086:591d] (rev 04) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:07bf]
     Subsystem: Dell Device [1028:07bf]
  InstallationDate: Installed on 2017-08-29 (2 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 
  MachineType: Dell Inc. Precision 5520
  Package: xorg-server (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.11.0-14-generic.efi.signed 
root=UUID=b79ae801-0652-4785-beaf-e8387d798948 ro acpi_rev_override quiet 
splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.11.0-14.20~16.04.1-generic 4.11.12
  Tags:  xenial ubuntu compiz-0.9
  Uname: Linux 4.11.0-14-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 05/08/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.3
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvr1.3.3:bd05/08/2017:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr: Precision 5520
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 

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