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#1 2018-06-11 17:32:58

squalou
Member
Registered: 2018-06-04
Posts: 28

[CLOSED] bluetooth adapter 'off' but ... not really off

Hi,
I wonder in which section my issue belongs. Let's try here as it's a low-level issue I guess.

I have a dell XPS13 9350, it works fine. I used to turn Bluetooth Off and On through gnome dropdown menu. Fine.

BUT I recently checked my laptop radiowaves emissions ... and even when bluetooth is OFF, and wifi is OFF (gnome displays the nice 'airplane mode' icon) : my latop emits steadily bluetooth signal !

I checked with 'bluetooth' command line : the adapter is seen, and has power=off status.

I cannot pair anything, that sounds logical I just mention it to say I tried : and the laptop is not seen as a pairable bluetooth device. But still it emits radiowaves.


Any idea what I can try ?

thx

Last edited by squalou (2018-06-18 09:26:52)

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#2 2018-06-11 17:50:07

c00ter
Member
From: Alaskan in Washington State
Registered: 2014-08-28
Posts: 246

Re: [CLOSED] bluetooth adapter 'off' but ... not really off

You installed bluetooth software, right? And enabled bluetooth in systemd? Could that possibly have some bearing on your "problem?"


UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things. -- Doug Gwyn

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#3 2018-06-12 08:30:13

squalou
Member
Registered: 2018-06-04
Posts: 28

Re: [CLOSED] bluetooth adapter 'off' but ... not really off

Hi,

indeed "bluetooth" is installed and enabled in systemd. But ... I don't see what it has to do with the fact that when I use "bluetooth" command line to power the device off, it tells me it's off, but is not really.

Would you suggest that I do a `systemctl stop bluetooth` instead of simply 'turn off with GUI' ?
Would be worth a try I guess but if it's true, what's the point in having a power on/off feature ?

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#4 2018-06-12 11:21:25

seth
Member
Registered: 2012-09-03
Posts: 8,169

Re: [CLOSED] bluetooth adapter 'off' but ... not really off

What's the rfkill status and can you succesfully rfkill he BT device?
(No idea what that GUI does, but in doubt it just deactivates BT discovery)

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#5 2018-06-12 19:36:38

squalou
Member
Registered: 2018-06-04
Posts: 28

Re: [CLOSED] bluetooth adapter 'off' but ... not really off

when I switch from On to Off here is what 'bluetoothctl' displays :

[CHG] Controller 9C:B6:D0:DE:8A:D4 Class: 0x00000000
[CHG] Controller 9C:B6:D0:DE:8A:D4 Powered: no
[CHG] Controller 9C:B6:D0:DE:8A:D4 Discovering: no

and rfkill :

$ rfkill 
ID TYPE      DEVICE      SOFT      HARD
 0 bluetooth hci0     blocked unblocked
 1 wlan      phy0   unblocked unblocked

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#6 2018-06-12 19:46:18

squalou
Member
Registered: 2018-06-04
Posts: 28

Re: [CLOSED] bluetooth adapter 'off' but ... not really off

Damn, I hate my laptop.
In order to copye/paste above command output, I had to reactivate BT in Bios.

Since this, guess what ? problem seems solved.

My measure system stop seeing BT a few seocnds aftter I siwtch off.

Sorry to have bothered you all hmm

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