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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
upstream:

https://patchwork.freedesktop.org/series/55415/

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

Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1714178/comments/61


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

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

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https://bugs.launchpad.net/bugs/1714178

Title:
  Triple 4K monitor display failed (modesetting driver limited to
  8192x8192)

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

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

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

  Steps:
  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
  https://goo.gl/vFDjpi

  WORKAROUND (UBUNTU 18.04+):
  Log in to "Ubuntu on Wayland" instead of "Ubuntu".

  ---
  .tmp.unity_support_test.0:

  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  DistUpgraded: Fresh install
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   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 
20160624-10:47
  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
  dmi.bios.date: 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.modalias: 
dmi:bvnDellInc.:bvr1.3.3:bd05/08/2017:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr:
  dmi.product.name: Precision 5520
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  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 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2

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