Attempts to make bluetooth keyboard usable under linux.

"FastConnectable"

    /etc/bluetooth/main.conf
    FastConnectable = false -> true

powertop

    Autosuspend for USB device xHCI Host Controller [usb?]
    Autosuspend for USB device 82EC-S [Milsky] <- this is my keyboard
    good -> bad

usbcore.autosuspend

    echo 5 | sudo tee /sys/module/usbcore/parameters/autosuspend

btusb.enable_autosuspend

    echo N | sudo tee /sys/module/btusb/parameters/enable_autosuspend

> been there, done that, none worked <

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My keyboard is hardly usable when connecting via BT 5.0. It can not be
the keyboard's problem, because when I use a special "bt->usb kbd"
adaptor it works perfectly. The adapter works in a way that, the
keyboard still uses the same BT protocol, but the adapter handles the BT
connection standalone, and registers to the system as if it was a usb
keyboard.

The problem only exists when I connect to the laptop bluetooth

Could be a problem with either
1. bad bluetooth adapter on board
2. bad driver in kernel

I haven't tested though: use the same hardwave but with a different
operating system.