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BT audio stuttering when WLAN enabled [duplicate]

asked 2018-03-12 10:51:54 +0300

Nrde gravatar image

updated 2018-09-19 11:38:13 +0300

As this was closed without giving a link to the duplicate issue I'll add it here:

this issue has been mentioned elsewhere in comments but I can't see that much activity and people are less active on commenting on them. I don't know if Jolla is tracking this issue so opening an issue.

BT audio/music being unusable if wlan is enabled. As soon as wlan is disabled the audio works more or less without issues.

Comments I've seen suggest over-agressive wlan search when no known wlan is in the range.

I have heard the light symptoms since Jolla 1, Jolla C (very occasional stutter) and now with Sailfish X, BT audio is plain unusable. When wlan is on and I leave the house, be in the car etc. where wlan is not available the audio keeps stuttering every 1-5 seconds.

Update: with the latest bluetooth has gotten even worse if possible.

  • connection to my car BT does not work reliably, deleting pairing and re-pairing works until the next time, before it connected automatically, except rare instances when I had to either turn the radio on of, or switch BT on/off on the phone.

  • before I could use "car set", but now it's not audible anymore although shows as "connected". To get sound from the phone (like music, podcast) "loudspeaker" type needs to be used. Obviously I haven't tested calling as it's not audible when car type is selected.

So all in all, BT support is getting worse.

Another update:

Automatic connection seems to kind of connect to car radio but without audio. Opening phone setting-> bluetooth and then connecting makes the audio work. Same stuttering as before when wlan is enabled though.

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The question has been closed for the following reason "duplicate question" by jiit
close date 2018-09-12 15:25:10.060400


I am not sure WLAN is the problem, I have a similar stuttering experience with using two Nokia 360 speakers (left, right), it usually helps when I disconnect and connect again. Also I have a different issue with car stereo (Navi 600), hands free profile, which disconnects after a couple of minutes.

pmelas ( 2018-03-12 12:10:42 +0300 )edit

I can reliably (100%) get rid of the stutter if I turn off wifi in settings. Note that the stutter happens reliably when the phone doesn't see known wlans. It happens a lot less when there's wlan available, although when it's weak (like it is in my office for example) I hear some occasional stutter.

I have tested it with Nokia BH-111 BT dongle, at home using logitech BT recevier and JVC car stereo (Parrot unit of some kind?), where I notice the stutter every time.

Nrde ( 2018-03-12 13:37:34 +0300 )edit

my xperia bluetooth connection also stuttering when moving and from distance more than 40 cm

meldolion ( 2018-03-13 22:44:57 +0300 )edit

What channel does the wifi use when the problem occurs?

vattuvarg ( 2018-06-03 20:49:43 +0300 )edit

Is there a way to know? For me the problem is when the wlan is on in the phone, but there is no connection. I.e., wifi is out of range.

Nrde ( 2018-06-03 23:06:10 +0300 )edit

3 Answers

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answered 2018-06-03 09:05:09 +0300

kristian80 gravatar image

I got this problem too. Fixed when i disabled wlan.

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answered 2018-06-03 12:00:37 +0300

fridl gravatar image

updated 2018-06-03 18:06:52 +0300

I have the Problem, too. But it does not help to deactivate WLAN.

EDIT: Can i somehow find out, which codec is used with the BT device and can i forbid some codecs manually? It seems, that not all codecs have massive issues...

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Same problem here. Very annoying bug.

louisbob ( 2018-06-03 19:32:58 +0300 )edit

What about aptx codec? does it work?

bennypr0fane ( 2018-07-13 14:57:38 +0300 )edit

Some people does not have the stuttering issue anymore with the latest Can anyone confirm this?

louisbob ( 2018-09-19 10:02:06 +0300 )edit

answered 2018-09-11 09:14:21 +0300

Olsen gravatar image

In my setup (Xperia X, SFOS, stuttering completely disappeared since I switched to a 5 GHz wlan. No stuttering even while running an ISP speedtest on the phone in parallel.

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How can I change my wlan to use 5GHz. As I'm using it at home (where I can modify my router), at work, at the university, EDUroam, airports etc.

Nrde ( 2018-09-11 10:20:28 +0300 )edit

The fundamental reason for the interference should be that both Bluetooth and WLAN (the usual 2 GHz channels) conflict at the 2.4 GHz frequency band. If stuttering disappeared by making WLAN use the 5 GHz band, this suggests that the assumed reason is probably correct.

jovirkku ( 2018-09-11 10:23:26 +0300 )edit

But what would be the reason that it works with Jolla 1 and C, or the stuttering is much less obvious, i.e., BT is usable when WLAN is enabled. On my devices BT with WLAN is unusable only with Sailfish X.

Nrde ( 2018-09-11 10:33:30 +0300 )edit

Ok, nice workaround. But only switching of wlan completely seems to do the trick for me. On 5GHz i still get occasional stutter. but much less than before.

mosen ( 2018-09-11 11:52:12 +0300 )edit

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Asked: 2018-03-12 10:51:54 +0300

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Last updated: 2 days ago