Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xorg-server (Ubuntu)
       Status: New => Confirmed

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  DP1.2 daisy-chain flickering

Status in linux package in Ubuntu:
Status in xorg-server package in Ubuntu:

Bug description:
  Hi all,

  I have a NUC7i7BNH with the latest BIOS (0062) running Ubuntu 18.04
  (uname -r = 4.15.0-15-generic). I have the NUC connected via USB-C to
  DisplayPort, to an Avocent SV340D KVM, then to a Dell U2415 which has
  DP1.2 enabled and is daisy-chainged to another Dell U2415 (DP1.2
  disabled on the second monitor as per Dell instructions).

  I am getting flickering whereby randomly display1 or display2 turn
  black and then back on again. When I disable DP1.2 on the display1,
  and therefore get a duplicate display (as opposed to extended) on
  display2, I get no flickering at all.

  The same setup yields no flickering when running from a Windows 10
  box, so don't think it is the monitors.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu6
  ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr 14 12:52:24 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
   Intel Corporation Device [8086:5927] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Intel Corporation Device [8086:2068]
  InstallationDate: Installed on 2018-04-01 (12 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180401)
  MachineType: Intel Corporation NUC7i7BNH
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-15-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install) 02/22/2018
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BNKBL357.86A.0062.2018.0222.1644 NUC7i7BNB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: J31145-307
  dmi.chassis.type: 3
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 2
dmi:bvnIntelCorp.:bvrBNKBL357.86A.0062.2018.0222.1644:bd02/22/2018:svnIntelCorporation:pnNUC7i7BNH:pvrJ31153-308:rvnIntelCorporation:rnNUC7i7BNB:rvrJ31145-307:cvnIntelCorporation:ct3:cvr2: Intel NUC NUC7i7BNH
  dmi.product.version: J31153-308
  dmi.sys.vendor: Intel Corporation
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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