After updated to the stable version here , I can't connect to my bluetooth keyboard, however my another bluetooth devices works well.
Here is details:
Linux version: 4.19.42-1-MANJARO KDE
Device: Filco Majestouch Convertible 2
I can succesfully connect if I reset the pair and type PIN to connect, but after reboot it won't reconnect automatically and keeps connect/disconnect. The only way is to delete the pair and pair again everytime I reboot the system - it's unacceptable!
bluetoothctl to see what's going on when the keyboard is trying to connect:
bluetoothctl Agent registered [CHG] Device <MACADDR> Connected: yes [CHG] Device <MACADDR> Connected: no [CHG] Device <MACADDR> Connected: yes [CHG] Device <MACADDR> Connected: no [CHG] Device <MACADDR> Connected: yes [CHG] Device <MACADDR> Connected: no
It seem the device tried 3 times to connect but fails. I also tried
kcmshell5 bluedevildevices org.kde.bluez: PendingCall Error: "Input/output error"
bluez throw an error this time.
However, It's strange that my another bluetooth headset ATH-SR5BT does not meet this error and can automatically connect just like before.
Another user have the same issue with me: [Stable Update] 2019-05-17 - Kernels, Grub, KDE, Deepin, Gnome, XFCE, LibreOffice, Bash, Systemd
He is using XFCE so I think it's not KDE that causes the bug.
Now you can update to 2019-07-03 and this version solved the problem!