Public bug reported:

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 on a Dell U2414 which has DP1.2 enabled and is daisy-
chainged to another Dell U2414 (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

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic third-party-packages ubuntu

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  DP1.2 daisy-chain flickering

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