signal reception not updated on bluetooth hands free with car

asked 2015-02-25 00:59:35 +0300

Amboss gravatar image

updated 2015-02-26 01:25:42 +0300

My car (with Audi MMI) shows signal reception from a bluetooth hands free device. If that devices supports it, that is.

Today I noticed, that signal level is not updated very often. In fact it didn't update at all most of the time. It even looks like the update occurs only if you change orientation of the phone as when picking it up (which is not a good idea many countries if police finds out) and otherwise signal calculation sleeps.

Setup: Phone was inside my arm rest. There is an Audi original charger and a signal booster in there so reception should be even better. With my old phone (N900) reception would would change ever so often, mostly being close to 100% because of the booster (which only amplifies when the arm rest is closed btw.) At one location of my daily trip routine it would drop to almost nothing. So I was curious how the Jolla would turn out at this point.

Answer: "kinda strange"

It stayed at 2 bars (40%) for the first part of my track. So I began wondering why there wasn't any change. I opened my arm rest and picked it up (more like turning it 90 degrees around the longest axis then acutally picking it up) and it changed to lowest. Probably because it was around the mentioned low reception location. It stayed low for a longer time - even when I moved to a location of usually better reception. I picked it up again and it went up to 3 bars. It stayed there for the rest of the trip.

Is there anyone who can confirm this behaviour? Does the Jolla stop calculating and/or stop sending information to the car when not being "properly shaken". The car is moving and therefore the Jolla is too, but this is of course different to someone having the phone in hand to look at it. Some power saving perhaps?

UPDATE 2015-02-26:

Yesterday it seems I followed a wrong lead. Today I was doing more things to check if it could be triggered by movement - shaking my Jacket with Jolla inside (to rule out the light sensor) - leaving Jolla in the open and strafing sensor - turning Jolla wildly nothing happened.

So maybe I was accidentally hitting the power button when picking up the phone yesterday. Turns out the only thing to get refreshing reception level is waking the phone by double tap or power button. As long as the screen would stay awake there would be a change in levels displayed. I could reproduce that many times. So it all seems to be related to screen off and power saving. Actually I assume it is only the part of displaying the information an not the calculation not taking place in the background. While this is perfectly reasonable when using the phone by itself - you can't see the level while screen is turned off - it becomes unfavourable with external devices like car kits.

There is another thing I noticed while staring at the cars display as often as never before. Reception level almost never went to 5 bars (maximum). I think I've seen that only once today. Glancing at the phone's icon it showed a similar behaviour. But that I am not sure of as I had to look on the road as well at least once in while ;)

Could that be related to this and that, which is pretty much the same?

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I have the same issue with my Ford Sync... The reception value is not updating (very often at least). I will try if it updates, if I 'shake'/wakeup my Jolla today.

ejjoman ( 2015-02-25 08:52:53 +0300 )edit

I confirm this on a Toyota Yaris, I noticed it last saturday. The signal bar remained at 1 (low) level because I began the calll exiting from an underground parking, but after getting to the outdoor streets the signal strength I am sure was more than 50%.

I didn't pick the phone out of the bag, btw ( 2015-02-25 13:14:37 +0300 )edit

My guess is that this happens due power savings, will ping the responsible devs.. :)

tigeli ( 2015-02-26 01:37:39 +0300 )edit

So, this morning, I tested this a little bit.

My findings:

  • Generally, the reception value gets updated in Idle. But it does not update it immediately.
  • When device is active (screen is on) the value gets updated immediately
  • The status of no reception gets never ever (I mean really never) sent to the car kit. Even when I enable flightmode (with Bluetooth turned on), the reception value stays on the last value.
ejjoman ( 2015-02-26 03:20:18 +0300 )edit

I can confirm all 3 points of @ejjoman

Amboss ( 2015-02-26 20:45:55 +0300 )edit