[Bug 1817944] Re: Kubuntu 18.04 does not display through mini-DP port on lenovo Helix 2

** Attachment added: "For completeness: xrandr for the micro-HDMI output on the tablet which works fine."
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1817944/+attachment/5242437/+files/xrandr_via_microHDMI

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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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