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I have a Lenovo Duet 3 Bluetooth keyboard, which works fine when connected physically (it has 5 pins for that) to its laptop, and also works as expected when I connect it to my Android phone.

However, I cannot get it to work under (Arch) Linux. Kernel and bluetooth stack (bluez-libs etc.) are up to date, so I connect the device using bluetoothctl (output abbreviated for clarity):

[bluetooth]# power on Changing power on succeeded [bluetooth]# scan on Discovery started [NEW] Device D6:45:02:72:41:4F Duet 3 BT [bluetooth]# pair D6:45:02:72:41:4F Attempting to pair with D6:45:02:72:41:4F [CHG] Device D6:45:02:72:41:4F Connected: yes [CHG] Device D6:45:02:72:41:4F ServicesResolved: yes [CHG] Device D6:45:02:72:41:4F Paired: yes [NEW] Primary Service (Handle 0x0000) /org/bluez/hci0/dev_D6_45_02_72_41_4F/service000a 00001801-0000-1000-8000-00805f9b34fb Generic Attribute Profile ... {more new services follow, e.g. for Dev. Information, Battery etc.} Pairing successful [Duet 3 BT]# trust D6:45:02:72:41:4F Changing D6:45:02:72:41:4F trust succeeded [Duet 3 BT]# connect D6:45:02:72:41:4F Attempting to connect to D6:45:02:72:41:4F Connection successful [Lenovo Duet 3 BT Folio]#

The device stays connected, and I can see battery information. So far, so good, but typing anything or using the trackpad does absolutely nothing, so it's pretty useless as an input device.

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    Can confirm the exact same behavior with a "Duet 3 BT Folio" keyboard on Debian Testing/Bookworm, kernel 5.17.0-1 at the moment. Haven't gotten any further than you, unfortunately 😞 Commented May 27, 2022 at 21:11

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Try to turn on Caps Lock before you detach the keyboard.

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    Can you explain why this might work? … … … … … … … … … … … … … … Please do not respond in comments; edit your answer to make it clearer and more complete. Commented Aug 3, 2022 at 19:55
  • Strangely enough, this does work. The Trackpad and mouse keys still don't work, but the keyboard functions well, including switching off Caps Lock. Maybe it's a quirk in the driver, or maybe in the keyboard's firmware itself, hard to say. Commented Aug 5, 2022 at 10:43
  • I undertook some more experiments. - It also works with NumLock. - Since the keyboard works fine with my phone, it's probably a quirk in Linux' bluetooth stack. I supspect it's related to sending a non-zero value for the Num/Caps/Scroll lock indicators. Commented Aug 5, 2022 at 10:57

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