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

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