For completeness, here the Xorg-log. It looks pretty similar to the log
of that FreeDesktop bug 106017; that is trying for ages to get the
display up. There it leads to heavy flicker, and here it leads to a
fail.

** Attachment added: "EDID_not_found"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1817944/+attachment/5242145/+files/EDID_not_found

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https://bugs.launchpad.net/bugs/1817944

Title:
  Kubuntu 18.04 does not display through mini-DP port on lenovo Helix 2

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  (This is probably related to bug 1816860, but with different hardware
  and a different appearance, so it is filed separately.)

  Using the levovo Helix 2 attached to its Pro keyboard, it is not possible to 
activate the monitor as attached. 
  The monitor is attached with a mini-DP-to-HDMI cable to the monitor (SONY), 
and is - in this case, contrary to the bug mentioned before - detected as can 
be seen by xrandr.
  But then it gives up after some time (see attachment of System Settings 
started from CLI and Xorg.log:
  $ tail /var/log/Xorg.0.log
  [   970.977] (II) modeset(0): Modeline "1920x1080"x0.0  138.12  1920 1968 
2000 2052  1080 1083 1089 1122 +hsync -vsync (67.3 kHz eP)                      
                                                        
  [   973.083] (II) modeset(0): EDID vendor "LGD", prod id 1121                 
                                                                                
                                                    
  [   973.083] (II) modeset(0): Printing DDC gathered Modelines:                
                                                                                
                                                    
  [   973.083] (II) modeset(0): Modeline "1920x1080"x0.0  138.12  1920 1968 
2000 2052  1080 1083 1089 1122 +hsync -vsync (67.3 kHz eP)
  [  1009.658] (II) modeset(0): EDID vendor "LGD", prod id 1121
  [  1009.658] (II) modeset(0): Printing DDC gathered Modelines:
  [  1009.658] (II) modeset(0): Modeline "1920x1080"x0.0  138.12  1920 1968 
2000 2052  1080 1083 1089 1122 +hsync -vsync (67.3 kHz eP)
  [  1099.146] (II) modeset(0): EDID vendor "LGD", prod id 1121
  [  1099.146] (II) modeset(0): Printing DDC gathered Modelines:
  [  1099.146] (II) modeset(0): Modeline "1920x1080"x0.0  138.12  1920 1968 
2000 2052  1080 1083 1089 1122 +hsync -vsync (67.3 kHz eP)

  (and so it continues).

  Connecting the tablet of the convertable itself with a micro-HDMI-to-HDMI to 
that same monitor works fine, however.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  udippel    1872 F.... pulseaudio
   /dev/snd/controlC0:  udippel    1872 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=73792941-18ec-4d73-9640-1844bdad05dc
  InstallationDate: Installed on 2019-02-16 (11 days ago)
  InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: LENOVO 20CHS10P02
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  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
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-45-generic N/A
   linux-backports-modules-4.15.0-45-generic  N/A
   linux-firmware                             1.173.3
  Tags:  bionic
  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

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