Kindle Scribe on Tumbleweed KDE

English Hardware
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So, after thinking out loud in the Reddit group as well, the solution came as the following:

Running mtp-detect with the Kindle connected, as a user, resulted in the following:

libmtp version: 1.1.22

Listing raw device(s)
Device 0 (VID=1949 and PID=9981) is a Amazon Kindle Scribe 32GB.
Found 1 device(s):
Amazon: Kindle Scribe 32GB (1949:9981) @ bus 1, dev 9
Attempting to connect device(s)
libusb_open() failed!: Permission denied
LIBMTP PANIC: Unable to initialize device
Unable to open raw device 0
OK.

Running the same command as root gave a much better result:

libmtp version: 1.1.22

Listing raw device(s)
Device 0 (VID=1949 and PID=9981) is a Amazon Kindle Scribe 32GB.
   Found 1 device(s):
   Amazon: Kindle Scribe 32GB (1949:9981) @ bus 1, dev 25
Attempting to connect device(s)
USB low-level info:
   bcdUSB: 512
   bDeviceClass: 0
   bDeviceSubClass: 0
   bDeviceProtocol: 0
   idVendor: 1949
   idProduct: 9981
   IN endpoint maxpacket: 512 bytes
   OUT endpoint maxpacket: 512 bytes
   Raw device info:
      Bus location: 1
      Device number: 25
      Device entry info:
         Vendor: Amazon
         Vendor id: 0x1949
         Product: Kindle Scribe 32GB
         Product id: 0x9981
         Device flags: 0x18008106
Configuration 0, interface 0, altsetting 0:
   Interface description contains the string "MTP"
   Device recognized as MTP, no further probing.
Device info:
   Manufacturer: Amazon
   Model: Kindle Scribe
[...]

This confirmed it is a permission issue. So I created the file /etc/udev/rules.d/99-kindle-scribe.rules with the following content:

SUBSYSTEM=="usb", ATTRS{idVendor}=="1949", ATTRS{idProduct}=="9981", MODE:="0666"

Reloaded the rules with:
# udevadm control --reload-rules

And Calibre can now see and manage the Kindle Scribe!

Thinking out loud in public really helps.

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