Bluetooth Keyboard with touchpad connected but not working - Lenovo IdeaPad Duet 5i

Hello Linux Experts

On my Lenovo IdeaPad Duet 5 12IAU7 the bluetooth keyboard (Lenovo Duet 5 BT Folio) gets connected, but doesn’t work - neither the keyboard nor the touchpad. I tried Fedora 36 & 37. When the keyboard is directly connected via the 5 pins connector, everything works. Expect that sometimes the touchpad stops working.

How can I fix these problems?

Thanks and best, Patrick