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Date: Thu, 10 Feb 2022 09:24:57 +0300
From: Yuriy Gerzel <yuriy@gerzel.ru>
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Установил на Raspberry Pi 4 Model B 4GB Alt Linux Workstation p10 через 
Raspberry Pi Imager (официальный образ). При попытке подключения к 
bluetooth-клавиатуре (через GUI и CLI) она сначала подключается на 
примерно одну секунду, а потом отсоединяется.

$ bluetoothctl
[bluetooth]# pair 34:88:5D:3C:07:D3
<ввод пин-кода>
Pairing successful
[bluetooth]# trust 34:88:5D:3C:07:D3
Changing 34:88:5D:3C:07:D3 trust succeeded
[bluetooth]# connect 34:88:5D:3C:07:D3
[CHG] Device 34:88:5D:3C:07:D3 Connected: yes
Connection successful
[CHG] Device 34:88:5D:3C:07:D3 Connected: no
[CHG] Device 34:88:5D:3C:07:D3 Class: 0x00000540
[CHG] Device 34:88:5D:3C:07:D3 Icon: input-keyboard
[CHG] Device 34:88:5D:3C:07:D3 Connected: yes
[CHG] Device 34:88:5D:3C:07:D3 Connected: no
[bluetooth]# connect 34:88:5D:3C:07:D3
Attemping to connect to 34:88:5D:3C:07:D3
Failed to connect: org.bluez.Error.Failed br-connection-create-socket

$ journalctl | tail -1
bluetoothhd[3682]: profiles/input/device.c:encrypt_notify() 
ioctl_connadd(): Protocol not supported (93)

Как я понимаю, проблема в ядре.

$ uname -a
Linux pi 5.12.17-rpi-un-alt1 #2 SMP Wed Feb 10 04:00:00 UTC 2021 aarch64 
GNU/Linux
(на ядре rpi-def точно такие же проблемы. Не смог проверить на std-def, 
так не подключился дисплей Waveshare 7inch LCD for Pi 
(https://www.waveshare.com/wiki/7inch_DPI_LCD), а HDMI кабеля нет в 
наличии).