Comment 40 for bug 1385113

Getting this on Ubuntu 20.04 with stock kernel 5.7 from the Mainline PPA.
Logitech K380 keyboard.
[ 229.061855] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 229.061860] Bluetooth: HIDP socket layer initialized
[ 234.275816] hid-generic 0005:046D:B342.0007: unknown main item tag 0x0
[ 234.276115] input: Keyboard K380 Keyboard as /devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-4/1-4.1/1-4.1.3
/1-4.1.3:1.0/bluetooth/hci0/hci0:65/0005:046D:B342.0007/input/input26
[ 234.277362] input: Keyboard K380 Consumer Control as /devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-4/1-4.1
/1-4.1.3/1-4.1.3:1.0/bluetooth/hci0/hci0:65/0005:046D:B342.0007/input/input27
[ 234.277675] input: Keyboard K380 System Control as /devices/pci0000:00/0000:00:01.3/0000:01:00.0/usb1/1-4/1-4.1/1
-4.1.3/1-4.1.3:1.0/bluetooth/hci0/hci0:65/0005:046D:B342.0007/input/input28
[ 234.278079] hid-generic 0005:046D:B342.0007: input,hidraw5: BLUETOOTH HID v42.01 Keyboard [Keyboard K380] on 00:1
a:7d:da:71:11

Keyboard won't pair, but can be "trusted" and "connected" and then it's usable. But doesn't reconnect automatically of course.