[ltp] Sleeping X390 discoverable on Bluetooth???

Marius Gedminas marius at gedmin.as
Tue Oct 13 08:28:28 CEST 2020

On Mon, Oct 12, 2020 at 09:43:36AM +0300, Marius Gedminas wrote:
> I've recently discovered that my X390 is discoverable on Bluetooth while
> it's in S3 sleep.  I have two questions:
> 1. What the heck?

So far it looks like if the OS (Ubuntu 20.04 LTS) leaves the BT
controller in discoverable state, it stays discoverable even while in S3

This is surprising to me.

> 2. How do I turn this off?

bluetoothctl discoverable off seems to have helped, but I don't want to
do that every time I reboot.

This smells like a bug somewhere.  AFAIU by design the BT controller
should be discoverable (and pairable) only when you have the Bluetooth
settings page open in gnome-control-center.  And yet I run bluetootctl
and I'm greeted with

    [CHG] Controller XX:XX:XX:XX:XX:XX Pairable: yes

I would file a bug, but I'm not sure which package is responsible for
making the controller discoverable/pairable and not resetting it back.

> (I'm pretty sure if there had been an obvious switch -- like wake on
> bluetooth -- in the UEFI setup, I'd've seen it and turned it off.)

Went through the setup again, just to be sure.  Nothing.

Marius Gedminas
Alan Turing thought about criteria to settle the question of whether
machines can think, a question of which we now know that it is about
as relevant as the question of whether submarines can swim.
                -- Dijkstra
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