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[Daniel van Vugt <1886729@xxxxxxxxxxxxxxxxxx>]

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** Changed in: mutter (Ubuntu)
       Status: New => Won't Fix

** Changed in: xorg-server (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1886729

Title:
  Dell displayport YJ3Y6 adapter doesn't drive 4K screen properly

Status in mutter package in Ubuntu:
  Won't Fix
Status in xorg-server package in Ubuntu:
  Won't Fix

Bug description:
  I have some early dell 4k 60hz screens - the ones which report 2
  panels internally for DP 60Hz - horrid hack I know; I recently got a
  new XPS laptop and put Ubuntu on it.

  That XPS laptop has two USB-C/thunderbolt ports, so to drive the
  screens I bought two slightly different DP adapters - one with power
  passthrough, and a cheaper one that only does DP.

  The more expensive one 'USB-C to HDMI/DP' drives the monitor happily
  over DP, though sadly only at 30Hz - can't have everything :/. It
  reports one monitor as one output: DP-1 in the attached information:

  DP-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
     3840x2160     29.98*+  30.00    29.97  
     1920x1200     59.88  
  ...

  
  The cheaper one reports the single monitor as two distinct outputs, at 60hz interestingly - 

  DP-3-8 connected (normal left inverted right x axis y axis)
     1920x2160     59.99 +
  DP-3-9 connected 1920x2160+7680+0 (normal left inverted right x axis y axis) 527mm x 296mm
     1920x2160     59.99*+
     1920x1200     59.88  

   which in theory if summed together would be one whole screen. But
  attempting to configure the output results in an error:

  xrandr --output DP-1 --auto --left-of eDP-1 --output DP-3-9 --auto --right-of DP-3-8 --output DP-3-8 --auto --right-of eDP-1
  xrandr: cannot find crtc for output DP-3-8

  I'm not sure if this is an intrinsic limitation of the USB-C->DP
  dongle, or whether there is something that can be done in the software
  to deal with this 10 year old hardware hack I have sitting on my
  desktop.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
  Uname: Linux 5.4.0-40-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Jul  8 11:20:17 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Iris Plus Graphics G7 [8086:8a52] (rev 07) (prog-if 00 [VGA controller])
     Subsystem: Dell Iris Plus Graphics G7 [1028:096d]
  InstallationDate: Installed on 2020-07-07 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  MachineType: Dell Inc. XPS 13 9300
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-40-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/08/2020
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.0.11
  dmi.board.name: 0WX9VX
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.0.11:bd05/08/2020:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn0WX9VX:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: XPS
  dmi.product.name: XPS 13 9300
  dmi.product.sku: 096D
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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