The three sets of three are: the first three on dock after start, the
next three off the dock and the last three after reinsertion. It looks
like no detection of any change with respect to display.

The machine is a Helix 2, Machine Type Model: 20CHS10P02 (details can be found 
on lenovo support website, if needed). It has a micro-HDMI-output on the 
tablet, but also offers video via a USB-2-video adapter (that I do not have, 
otherwise I could test it).
The dock is 4X10H04503, details under 
https://support.lenovo.com/de/en/accessories/ACC100200. It has one HDMI-plug 
and also some USBs that are said to allow the use of the adapter as described 
above. 
The external monitor is a SONY Digital-TV BRAVIA, KDL-32CX525.

If it helps, I can produce a Youtube-clip showing the behaviour. Maybe
that helps?

I also wonder, if it is possible one way or another to store the dmesg
respectively the xorg log for those sessions that need abandoning due to
only the mouse cursor being visible. Do you think those could help to
identify what makes the boot-up process stop? Or do you think it goes
through and simply doesn't send anything to the display?

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1816860

Title:
  Second display does not show up on dock of Lenovo Helix 2

Status in xorg-server package in Ubuntu:
  Incomplete

Bug description:
  To me a deal-breaker: I bought the Helix 2 as machine on the dock, and I also 
bought the one out of the three docks that doesn't need extra driver (so it 
says), the 4X10H04503. I stuck the tablet into it, with Windows, and the second 
display came up without any additional driver. 
  With kubuntu 18.04 I can't make it appear. xrandr doesn't show it. 
  Now I wonder, where else it might pop up? I mean, the dock works, I ran a 
unified Logitech receiver on it, and from the first second mouse and keyboard 
are available to my *buntu installation, of course the grub menu. 

  I am quite disheartened, since I don't feel like going back to Windows after 
some 20 years on *nix. 
  I am willing to help out as much as my very limited abilities allow me to. 
  I can't believe that a dock which actually supplies power and keyboard and 
mouse data does not supply any information about the second monitor?
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: KDE
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroRelease: Ubuntu 18.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: I just need to know a workaround
  GraphicsCard:
   Intel Corporation HD Graphics 5300 [8086:161e] (rev 09) (prog-if 00 [VGA 
controller])
     Subsystem: Lenovo HD Graphics 5300 [17aa:222b]
  InstallationDate: Installed on 2019-02-16 (4 days ago)
  InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: LENOVO 20CHS10P02
  Package: xorg-server (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-45-generic 
root=UUID=0f5d3b8a-5cae-45cb-a42d-b89344359b2f ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
  Tags:  bionic ubuntu
  Uname: Linux 4.15.0-45-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 10/31/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N17ETA2W (2.02 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CHS10P02
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 11
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN17ETA2W(2.02):bd10/31/2018:svnLENOVO:pn20CHS10P02:pvrThinkPadHelix2nd:rvnLENOVO:rn20CHS10P02:rvrSDK0E50510WIN:cvnLENOVO:ct11:cvrNone:
  dmi.product.family: ThinkPad Helix 2nd
  dmi.product.name: 20CHS10P02
  dmi.product.version: ThinkPad Helix 2nd
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.95-1~18.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1~18.04.2
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.2-0ubuntu1~18.04.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2
  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 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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