Since updating to Android 15 I have found that Bluetooth is causing problems especially with audio playback to a Bluetooth device.
Each time playing an album when moving to the next track play stops. I have to disconnect the Bluetooth device, start audio playback on phone then reconnect the Bluetooth device.
Has anyone else had this problem or know a solution?
Which app do you use for audio playback?
Iâve tried BubbleUPNP and Hi-Fi Cast. Both exhibit the same problem.
Could you try the app VLC?
VLC does appear to work. However VLC itself seems to be a bit problematic in that it wont scan my music server properly and it stopped playing local music files when focus was taken by my web browser.
This is a different issue to the Bluetooth audio though.
It could be a similar issue to that seen with FP5 when it moved to A15. See this post
Iâm also having major Bluetooth problems on my Fairphone 4 since updating to Android 15 with my medical devices (Freestyle Libre, MedTrum Nano Touchcare).
The corresponding apps (LibreLink and EasyPatch) are allowed to run in the background.
The only way Iâve found to temporarily restore connectivity with these devices is to restart my phone. But the connection drops again after a few minutes.
I opened a support ticket over 10 days ago, but I still havenât received any response.
I have the same issue with my Freestyle Libre 2.
Any update on this?
I am switching to Diaexpert sensors. The hospital gave me 1 to try and works much more reliable. But I still have like 8 of those Libre sensors 
Same issue here with Freestyle Libre 2 and the official LibreLink app. I can scan the sensor with NFC (although the scanning often takes several tries), but connecting over bluetooth fails.
I also tried using Juggluco but get the same results â NFC works, bluetooth doesnât
A post was split to a new topic: After upgrade to Android 15 I canât stream my amplifon ear divices
Have you tried :
Settings of LibreLink > Battery Usage > Click on the âAllow Background Executionâ > Unrestricted
I also found in developers mode :
âBluetooth searchâ : reactivate the option if itâs off
All the settings are already configured as you described.
Have you seen this post :
Could you try and tell if this works also for you ?
What worked for me was downgrading to Android 13 which was a hassle as everything is wiped in the process but it was worth it. For @Fairphone_CM sustainability is not just about hardware but perhaps the software is even more important. I personally wonât think I will buy anything from Fairphone again. Even the Fairbuds I have bought⊠the software is (equalizer etc) really terrible. The hardware is fine.
Thank you so much for this procedure.
I have tried it, hereâs my feedback:
adb shell pm grant com.freestylelibre.app.fr android.permission.POST_NOTIFICATION
adb shell pm grant "$package" android.permission.POST_NOTIFICATION
Exception occurred while executing 'grant':
java.lang.IllegalArgumentException: Unknown permission android.permission.POST_NOTIFICATION
No execution problem with others commands
But, I still have same Bluetooth deconnection problems
Just posted it in another thread: the adb so far did not work for me, but still looking - there seems to be a typo in the original post - as far as I found out, the correct call is
android.permission.POST_NOTIFICATIONS
(extra âSâ at the end) good luck!
Is anybody test FP4.SREL.15.14.4 released 06 January 2026?
If yes, does it fix this issue ?
Hi jycr,
as this update is announced just as a security update, there should be no fix regarding bluetooth problems included. There was no report about changed behavior in bluetooth connections after installing this patch. See also
Greets Robert
Not sure if it is bluetooth related, but with Android Auto I now often have disconnects or short interrupts.
Here is what I found out debugging an issue when trying to connect Meta Glasses to the Fairphone 4:
Bug Report: BLE L2CAP COC Connection Failure on Fairphone 4 with Android 15
BLE L2CAP Connection-Oriented Channel (COC) connections fail on Fairphone 4 running Android 15. The secure L2CAP data channel times out after 30 seconds, preventing companion apps from completing pairing with BLE accessories. This is a regression from Android 13 where the same device and accessories worked correctly.
ro.hardware=qcom)android.hardware.bluetooth@1.0-service-qti)0000fd5f-0000-1000-8000-00805f9b34fbWhen attempting to pair Meta Ray-Ban glasses via the Meta AI app (com.facebook.stella), the BLE GATT connection succeeds but the L2CAP COC connection fails. The connection attempt times out after exactly 30 seconds.
dumpsys bluetooth_manager00:01:08.669 xx:xx:xx:xx:29:67 STATE_CONNECTING ROLE_CONNECTION 129 L2CAP_LE
00:01:38.672 xx:xx:xx:xx:29:67 STATE_DISCONNECTING ROLE_CONNECTION 129 L2CAP_LE
00:01:38.672 xx:xx:xx:xx:29:67 STATE_DISCONNECTED ROLE_CONNECTION 129 L2CAP_LE
The connection stays in STATE_CONNECTING for exactly 30 seconds before timing out.
E BleConnection-Supernova: Failure to connect to l2cap
E BleConnection-Supernova: com.facebook.wearable.connectivity.bluetooth.api.BleL2CapException: Unable to connect to l2cap
E BleConnection-Supernova: Caused by: android.bluetooth.BluetoothSocketException: A Bluetooth Socket failure occurred
E BleConnection-Supernova: at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:475)
I ConnectivityStartupLogger: markConnectionAttemptPoint CONNECT_L2CAP_FAILED
I BluetoothAdapterService: Statslog L2capcoc client connection. metricId 24 port 129 isSecured true result 0 endToEndLatencyMillis 30011 socketCreationLatencyMillis 0 socketConnectionLatencyMillis 30010
I BtSocketManagerBinder: connectsocket: device=XX:XX:XX:XX:66:9D, type=4, uuid=00000000-0000-0000-0000-000000000000, port=129
I bt_btif_sock: btsock_connect: Attempting socket connection for device: xx:xx:xx:xx:29:67, type: 4, channel: 129
I bluetooth: btsock_l2cap_alloc_l: Allocated l2cap socket structure
I bt_l2cap: L2CA_RegisterLECoc: Registered service LE COC PSM: 0x0081
Based on research (Google Issue Tracker #371713238), the Android Bluetooth stack sends L2CAP extended flow control packets and blocks waiting for a response. Some BLE devices (including Meta glasses and AirPods) do not respond to these packets, causing the connection to hang until timeout.
The problematic code is in:
system/stack/l2cap/l2c_link.cc (line 118)system/stack/l2cap/l2c_fcr.cc (lines 1605-1610)| Workaround | Result |
|---|---|
| Grant all location permissions | Required but not sufficient |
| Factory reset glasses | No effect |
| Clear app data and bonds | No effect |
| Toggle Bluetooth off/on | No effect |
| Adjust BLE scan parameters | No effect |
device_config L2CAP flags |
Cannot persist without root |
| Disable A2DP hardware offload | No effect |
| Change AVRCP version (1.4) | No effect |
| Change MAP version (1.2) | No effect |
com.android.bluetooth.flags.bt_socket_api_l2cap_cid=false
com.android.bluetooth.flags.higher_l2cap_flush_threshold=false
com.android.bluetooth.flags.l2cap_le_do_not_adjust_min_interval=false
com.android.bluetooth.flags.l2cap_p_ccb_check_rewrite=false
com.android.bluetooth.flags.l2cap_tx_complete_cb_info=false
These flags cannot be modified without root access.
Bluetooth problems since Android 15 update
Per Google Issue #371713238, the fix requires modifying the Bluetooth stack to:
l2c_fcr.cc and rebuild libbluetooth_jni.so.com.facebook.stella)L2CAP COC connection should establish within a few seconds, allowing the companion app to complete the pairing handshake.
L2CAP COC connection times out after 30 seconds. App reports pairing failure despite successful GATT connection and system-level Bluetooth bond.
Logcat output and dumpsys bluetooth_manager output available upon request.
just to make that clear, you cant send bug reports to FP using the forum.