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Why My Bluetooth of Xiaomi Note Pro can not connect to car bluetooth?

In these days, I find my Mi note Pro can not connect to bluetooth well, it always disconnected after a few minutes when I drive my car, yes, I often listen the music when drive, so I connect the Mi Note pro to car by bluetooth, i can sure it is not the problem of my car, is anyone else meet this situation?

Go Swalle said:
In these days, I find my Mi note Pro can not connect to bluetooth well, it always disconnected after a few minutes when I drive my car, yes, I often listen the music when drive, so I connect the Mi Note pro to car by bluetooth, i can sure it is not the problem of my car, is anyone else meet this situation?
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I have the same problem. It's a rom bug... and and there is no solution yet. It is a known problem but never solved.

khmoc said:
I have the same problem. It's a rom bug... and and there is no solution yet. It is a known problem but never solved.
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Thanks for your response. this is very strange probelm, two month before did not appear this problem, but in these current days.
Maybe it is the problem of the system version of Xiaomi note pro, if I can solve this, I will let you know.

Interesting. I just got my Note Pro so didn't get to use the car Bluetooth receiver a lot yet but so far it's been working fine, playing several times for more than an hour without disruption. Maybe it's one of those extensive power-saving settings that are responsible? Or the "Clean Master" that is set to kick in after 30 mins since the screen was turned off by default? I was using Google Maps for navigation while also playing music in the car, so the screen was on all the time, perhaps that would explain why it didn't happen to me?

What's your ROM version, mine works flawless.

Earlier today I was using the car Bluetooth receiver with the phone in my pocket on battery power - no problems whatsoever (5.12.31 Developer ROM). I'd try with another phone first, maybe it's some sort of interference or a problem with the receiver after all?
Is that an aftermarket Bluetooth receiver plugged into the lighter socket? They're not famous for their reliability, and with time it the socket parts themselves can become loose causing intermittent power failures. Or does it always stop working after the same amount of time passes? Maybe you have some battery-saving app or settings that switches it off then.

AA Troubles: GPS no data --> AA disconnects

Hi,
After several months using AA in a Golf MY16 with two different smarphones with Android 5.0 & 5.1, using different AA releases, then I have found one "use case" when the AA "fails" (=disconnects from the HU):
* When you're driving inside a tunnel and the car's GPS losses the signal, in this case the AA *always* disconnects from the Head Unit.
Did you have a similar experience?

Hi,
No one with similar behaviour? :silly:

No problem with my 2016 Jetta. Google Maps says me that GPS signal was lost but there is no error. Are you sure it's using the car GPS ? I find it is not very accurate at some places.. Which phones do you use ? I found Marshallow more stable than Lollipop with Android Auto. I had connection drops with 5..1.1 but it was random and not related to GPS signal lost. No problem at all with 6.0.

marcjero said:
I found Marshallow more stable than Lollipop with Android Auto. I had connection drops with 5..1.1 but it was random and not related to GPS signal lost. No problem at all with 6.0.
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Thank you for the report! I'm using Lollipop 5.0 & 5.1 in two different smartphones. I'll check with some spare MM 6.0 when I have time.
:good:

you are welcome.
It seems that Android Auto is using the phone GPS (at keast with the VW head unit) Just try to disable the phone GPS before connecting the phone to the car and start Maps : you will be asked to enable the GPS. Really sad.

Hi,
If it's true that AA is using internal (phone) GPS instead of car GPS (almost in a Golf MY16), then the problem can be when the PHONE losses the GPS data... Even, I feel the real problem is: the phone likes to say "GPS disconnected" and the disconnection ocurs because some trouble exists with the audio output.
I also detected that sometimes when a WhatsApp is received, also the AA is disconnected. I hope Google can fix this trouble with the "AUDIO OUTPUT".
You have a similar problem?

manos78 said:
Hi,
If it's true that AA is using internal (phone) GPS instead of car GPS (almost in a Golf MY16), then the problem can be when the PHONE losses the GPS data... Even, I feel the real problem is: the phone likes to say "GPS disconnected" and the disconnection ocurs because some trouble exists with the audio output.
I also detected that sometimes when a WhatsApp is received, also the AA is disconnected. I hope Google can fix this trouble with the "AUDIO OUTPUT".
You have a similar problem?
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Yes I got something similar when trying to run Waze in the background. Waze audio notification made the connection drop. It was with 5.1..1. I can have a try with Marshallow.
UPDATE : no problem at all with Marshallow (CM13) : I was able to run Maps and Waze at the same time. Got Waze audio notifications. No USB connection drop. The only issue is my Nexus 4 did a shutdown because it was overheating but it's a common issue with the Nexus.

marcjero said:
UPDATE : no problem at all with Marshallow (CM13) : I was able to run Maps and Waze at the same time. Got Waze audio notifications. No USB connection drop. The only issue is my Nexus 4 did a shutdown because it was overheating but it's a common issue with the Nexus.
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Thanks for the info! :good:
I suspect the problem is then related to the audio route inside Android 5.x

Hi,
More info:
Using Android 5.x, VW Golf MY2016 with CAR GPS, and last AndroidAuto App, the GPS signal is comming... FROM THE PHONE! So, yes, VW is not sending GPS signal to the AA process. In this case, when the phone losses the GPS signal, the AA process crashes. This is then the problem in my system: when GPS signal is lost inside a tunnel, then the HeadUnit disconnects with the AA process.
I hope Google fixes soon this problem. Also, I hope VW can upgrade the MIB software for sending ALL car data (including GPS position and ORIENTATION) to the AA process.
Regards.

And hope a droid will accept that data.
Sent from my SM-T520 using Tapatalk

Nova5 said:
And hope a droid will accept that data.
Sent from my SM-T520 using Tapatalk
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Yes I'm afraid AA is too much complicated. It crashes for many phones. Manufacturers doesn't implement all the features but imagine you have to build a head unit with GPS, Car Play, Android Auto, MIrrorlink... and all these subsystems (that does the same job : screen mirroring) have to send car and gps data to phones. using all the protocols. That's just crazy. And when it works you get frustrated because of usage limitations.

Audio over Bluetooth stutter when Mobile Hotspot is on

Hi,
I'm having a strange issue with audio over Bluetooth when Mobile Hotspot is on and I was wondering if there is anyone who can help me out.
When my Mobile Hotspot is on and I'm listening music in my car over Bluetooth there is sometimes a random stutter in my audio.
The stutter (no audio for small amount of time) only lasts ~300ms but it totally random. Sometimes there are a few stutters in a few minutes of time, but sometimes it can also a just one stutter within 15 minutes.
I've got a dashcam in my car that I want to have connected to the internet when I'm driving, so that's why I'm using my Mobile Hotspot in my car.
The data flow is as follows (simultaneously):
4G connection => Deezer music app => Bluetooth => audio.
Dashcam => Mobile Hotspot => 4G Connection.
I've got a feeling that the stutter is happening when some network activity is happening over the Mobile Hotspot, but I'm not sure.
When I disable my Mobile Hotspot the stutters are gone.
Your help is appreciated!
Edit:
After more testing it has nothing to do with the Mobile Hotspot, but with Bluetooth in general. Especially when receiving a notification while streaming audio over Bluetooth gives me stutter.
I have the 8GB Exynos (512GB) edition

I'm getting the random Bluetooth hiccup without hotspot enabled.

Also me even when I connect one Bluetooth device

Hm, yesterday was the first time since this phone releases that my Bluetooth connection also sometimes stutters, even without the Mobile Hotspot enabled. It's a lot less than having Mobile Hotspot enabled but it still happened.
Very weird, my Bluetooth connection also stuttered on my previous phone, the Samsung Note 3. Only on the stock rom though, when I used LineageOS the stutters were gone.

I was getting audio stutter over Bluetooth with music and notifications causing problems. My phone is being sent back Monday though.

From the op I was maybe thinking some crossover signal interference, but with a number of you saying the same and now I've just tried my Bluetooth ear buds and they stutter a little too, I guess it's a more general issue. I doubt it's a hardware problem as Bluetooth isn't exactly a new thing, I can't see Samsung using shoddy radios. I assume software as stuttering seems worse with screen off, maybe some power saving feature misbehaving, or background processes not getting priority, I don't know. Hopefully an update fixes it.
Are any of you on custom ROMs and experiencing it?
I'm going to flash one as soon as my memory card arrives, I thought woohoo 128 GB, no need to buy yet another card for another device, then read all the development forums that say in the process you need to format data haha, so a card is needed after all ? But once I'm done I'll test Bluetooth again.

beta546 said:
From the op I was maybe thinking some crossover signal interference, but with a number of you saying the same and now I've just tried my Bluetooth ear buds and they stutter a little too, I guess it's a more general issue. I doubt it's a hardware problem as Bluetooth isn't exactly a new thing, I can't see Samsung using shoddy radios. I assume software as stuttering seems worse with screen off, maybe some power saving feature misbehaving, or background processes not getting priority, I don't know. Hopefully an update fixes it.
Are any of you on custom ROMs and experiencing it?
I'm going to flash one as soon as my memory card arrives, I thought woohoo 128 GB, no need to buy yet another card for another device, then read all the development forums that say in the process you need to format data haha, so a card is needed after all But once I'm done I'll test Bluetooth again.
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I just went through the list of apps and disabled battery optimizations for Bluetooth and the Deer music app. I also have disabled battery optimizations for Mobile Hotspot, in the Hotspot settings.
Next week I will try to test this and hope there will be a difference. If I can't notice any differences I think I will try to contact Samsung about this.
I know when I used CyanogenMod and LineageOS on my Samsung Note 3 the stutters were gone, but I don't want to flash my new Samsung Note 9 yet.

Hendriksie said:
I just went through the list of apps and disabled battery optimizations for Bluetooth and the Deer music app. I also have disabled battery optimizations for Mobile Hotspot, in the Hotspot settings.
Next week I will try to test this and hope there will be a difference. If I can't notice any differences I think I will try to contact Samsung about this.
I know when I used CyanogenMod and LineageOS on my Samsung Note 3 the stutters were gone, but I don't want to flash my new Samsung Note 9 yet.
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Yes I have done similar but not had chance to test it yet. I wouldn't waste your time contacting Samsung, they'll either fix it, or they won't, regardless of what anyone wants haha

beta546 said:
Yes I have done similar but not had chance to test it yet. I wouldn't waste your time contacting Samsung, they'll either fix it, or they won't, regardless of what anyone wants haha
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Hmm, I've tested more today but disabling battery optimizations doens't do anything.
And I've noticed that these stutters are happening when receiving notifications, as mentioned above. So I think this has nothing to do with the Mobile Hotspot.
I hope Samsung fixes this, I'm not the one having this problem.

Im having B/T issues too. Random disconnects and reconnects, stuttering, etc.
Others on the Samsung forums are having the same issue.
There is something wrong with the bluetooth stack. This is undeniable.

I guess I'll hold on to my note 8 for now; reading alot of weird stuff about the 9, and a new flagship shouldn't have all this going on with it right out of the gate..

Scott said:
Im having B/T issues too. Random disconnects and reconnects, stuttering, etc.
Others on the Samsung forums are having the same issue.
There is something wrong with the bluetooth stack. This is undeniable.
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Do you happen to have a link to the Samsung Forum topic(s)?
Thank you!

No issue here
I have Exynos 8GB

No issues here. Tried with multiple headphones and the car too. Exynos 128.
Sent from my Samsung SM-N950F using XDA Labs

Yathani said:
No issue here
I have Exynos 8GB
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fulcrum1971 said:
No issues here. Tried with multiple headphones and the car too. Exynos 128.
Sent from my Samsung SM-N950F using XDA Labs
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What happens when you receive a notification when streaming audio over Bluetooth? no stutter at all?

Hendriksie said:
What happens when you receive a notification when streaming audio over Bluetooth? no stutter at all?
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No. Just a pause, notification, pause and back to music.
Sent from my Samsung SM-N950F using XDA Labs

Hendriksie said:
What happens when you receive a notification when streaming audio over Bluetooth? no stutter at all?
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A get the audio fade out and in as I did with my note 8.
Sent from my SM-N960U1 using Tapatalk

Hendriksie said:
What happens when you receive a notification when streaming audio over Bluetooth? no stutter at all?
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No issue at all. I stream youtube to my car aux bluetooth. I receive multiple notifications as well as calls.

Weird, some have stutter and some have not.
Will try to have the screen turned on while stream music, see if that makes any difference.
Or maybe changing Bluetooth settings in the Developer Options will do something.

Hmm, have the screen turned on while streaming dind't do anything and changing Bluetooth settings in the Developers Options didn't do anything as well.

Bluetooth audio issues

Hi everyone, I have a problem with Bluetooth audio, whenever I use wireless earphones and put the phone in my pocket (sometimes it happens with the phone lying on the table), the audio starts chopping every 3-5 seconds and it's very annoying. Right now I'm using the Xiaomi Mi Air Dots Pro but this has also happened with the Mindkoo MK-BE01.
I've already googled this issue but I had no luck except for this post explaining something similar but on the Mi A2 Lite. https://forum.xda-developers.com/mi-a2-lite/help/bluetooth-audio-issues-pie-t3886132
I've also found posts for other phones (Pixel and S8/S9 mainly) with the same issue and I have tried the fixes I found there (clearing Bluetooth data and cache, removing Bluetooth from battery optimizations, pairing the earphones again) but none of them work.
I'm on Pie with the February security update. I can't tell if this problem was present in Oreo because I didn't use wireless earphones back when I was using Oreo.
Is anyone having the same issue? Does anyone know how to fix it or what is causing it?

Try disabling bluetooth scanning under location settings

jsiklosi said:
Try disabling bluetooth scanning under location settings
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Already tried that, didn't work

Metoo! Bluetooth seems to go off when screen goes on. Most annoying.

BT disconnecting while hotspot on

Hello,
from MIUI 11 i am experiencing issue with BT devices disconnecting while using wifi hotspot. Once hotspot is active everything works for a while but then BT stops working and disconnects devices.
IT IS present Also in custom roms. Anyone Has this issue and know about some fix?
Many thanks.

bakosmi said:
Hello,
from MIUI 11 i am experiencing issue with BT devices disconnecting while using wifi hotspot. Once hotspot is active everything works for a while but then BT stops working and disconnects devices.
IT IS present Also in custom roms. Anyone Has this issue and know about some fix?
Many thanks.
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Is your hotspot in the 2.4 GHz band ? If the answer is yes, try 5 GHz.

DeepAnger said:
Is your hotspot in the 2.4 GHz band ? If the answer is yes, try 5 GHz.
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i will try, but unfortunately the client devices does not support 5ghz
i think it's a hardware issue as it does it with every, also custom roms...

bakosmi said:
i will try, but unfortunately the client devices does not support 5ghz
i think it's a hardware issue as it does it with every, also custom roms...
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It's mostly unrelated (at least with phone) but I recently started using a new small PC. The bluetooth disconnected too easily, even at less than 2 meters, a slight move of my head(phone) was enough to cut the music. Then I disabled the Wi-Fi interface and Bluetooth connection became robust even in the next room several meters away. That's probably because Wi-Fi and BT uses the same 2.4 GHz band.
Concerning Xiaomi smartphones, I use them everyday to listen to music while Wi-Fi is on (either in the 2.4 or 5 GHz band) and never observed a disconnection (xiaomi.eu or other custom ROMs). But I haven't tried in hotspot mode.

DeepAnger said:
It's mostly unrelated (at least with phone) but I recently started using a new small PC. The bluetooth disconnected too easily, even at less than 2 meters, a slight move of my head(phone) was enough to cut the music. Then I disabled the Wi-Fi interface and Bluetooth connection became robust even in the next room several meters away. That's probably because Wi-Fi and BT uses the same 2.4 GHz band.
Concerning Xiaomi smartphones, I use them everyday to listen to music while Wi-Fi is on (either in the 2.4 or 5 GHz band) and never observed a disconnection (xiaomi.eu or other custom ROMs). But I haven't tried in hotspot mode.
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yes it's work as it should until i enable the hotspot, even then, it works sometimes for like an hour and then it starts... solution is airplane mode on/off and it works for a few again.
i use this a lot, as i do hotspot for kids and wife in the car, and i also work a lot remotely and this disconnects everything from BT audio to watch and it's really annoying. :/

bakosmi said:
yes it's work as it should until i enable the hotspot, even then, it works sometimes for like an hour and then it starts... solution is airplane mode on/off and it works for a few again.
i use this a lot, as i do hotspot for kids and wife in the car, and i also work a lot remotely and this disconnects everything from BT audio to watch and it's really annoying. :/
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I just made the test, phone connected to LTE and my home routeur in the 5 GHz band. Then connected in aptX HD to "PLT Focus" headphone. After that I turned on hotspot in the 2.4 GHz and I havent observed a disconnection yet (after 15 minutes). But I live in the countryside where the whole Wi-Fi spectrum appears almost unused. I usually can detect only one other access point with a very weak signal. So, even if I was able to test for several hours, it wouldn't prove anything as your use case is very different. It may come from interferences on the same channels used by others while your vehicle moves. I don't know if we can control what channel is allocated by the hotspot but it's probably dynamic. I guess that when you switch off then on, it just select another less used channel then it works again for a while.