Thanks for the testing. There are two new commits that should fix this issue:
commit 09f3dbe474735df13dd8a66d3d1231048d9b373f
Author: Hans de Goede <hdego...@redhat.com>
Date:   Mon Oct 7 20:56:26 2019 +0200

    HID: i2c-hid: add Trekstor Primebook C11B to descriptor override
    
    The Primebook C11B uses the SIPODEV SP1064 touchpad. There are 2 versions
    of this 2-in-1 and the touchpad in the older version does not supply
    descriptors, so it has to be added to the override list.
    
    Cc: sta...@vger.kernel.org
    Signed-off-by: Hans de Goede <hdego...@redhat.com>
    Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@redhat.com>

commit 37d960a4d753605ca248baea577eaaa96f5dccf0
Author: Hans de Goede <hdego...@redhat.com>
Date:   Sun Aug 18 13:04:51 2019 +0200

    platform/x86: touchscreen_dmi: Add info for the Trekstor Primebook C11B 
2-in-1
    
    Add touchscreen info for the Trekstor Primebook C11B 2-in-1, note the C11B
    used the same touchscreen as the regular C11, so we only add a new DMI
    match.
    
    Cc: Thomas Hiller <thomas.hil...@gmx.de>
    Reported-and-tested-by: Thomas Hiller <thomas.hil...@gmx.de>
    Signed-off-by: Hans de Goede <hdego...@redhat.com>
    Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>


Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.4-rc6/

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https://bugs.launchpad.net/bugs/1850681

Title:
  TREKSTOR Primebook C11B touchpad and touchscreen not working

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  touchpad not working, only usb-mouse is recognized. touchscreen functionality 
not working, but that would be rather less important. Everything else is 
perfectly fine. (18.04 LTS)
  TREKSTOR Primebook C11B

  Thanks :-)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7.1
  ProcVersionSignature: Ubuntu 5.0.0-32.34~18.04.2-generic 5.0.21
  Uname: Linux 5.0.0-32-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Oct 30 18:43:32 2019
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: I just need to know a workaround
  GraphicsCard:
   Intel Corporation Device [8086:5a85] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Intel Corporation Device [8086:2212]
  InstallationDate: Installed on 2019-10-26 (4 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
  MachineType: TREKSTOR Primebook C11B
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-32-generic 
root=UUID=efc3c4a6-eb3c-4dc1-8a8e-0f53d786817d ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/03/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V2.1.2
  dmi.board.asset.tag: Default string
  dmi.board.name: Apollolake_alk_V01
  dmi.board.vendor: TS_weibu
  dmi.board.version: Default string
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 31
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV2.1.2:bd05/03/2018:svnTREKSTOR:pnPrimebookC11B:pvrDefaultstring:rvnTS_weibu:rnApollolake_alk_V01:rvrDefaultstring:cvn:ct31:cvrDefaultstring:
  dmi.product.family: Notebook
  dmi.product.name: Primebook C11B
  dmi.product.sku: CFALKWW03
  dmi.product.version: Default string
  dmi.sys.vendor: TREKSTOR
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.97-1ubuntu1~18.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.8-0ubuntu0~18.04.3
  version.libgl1-mesa-glx: libgl1-mesa-glx 19.0.8-0ubuntu0~18.04.3
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

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