Unable to turn on bluetooth on Mi A2

Sladek9

@sladek9 So now it stopped working again. I cannot make it working and rfkill list bluetooth gives:

0: bt_power: Bluetooth
Soft blocked: no
Hard blocked: no

the section about hci0 is missing. Does anybody know what this means?
Thank you.

Sladek9

@sladek9 I made another finding by using dmesg | grep -i blue
It seems that there was some failure during bluetooth initiation. The output is below:

phablet@ubuntu-phablet:~$ dmesg | grep -i blue
[ 1.363871] Bluetooth: fffffffcf9533d68
[ 1.363919] Bluetooth: fffffffcf9533d68
[ 1.363933] Bluetooth: fffffffcf9533d48Bluetooth: fffffffcf9533d28
[ 1.363975] Bluetooth: fffffffcf9533d48<6>[ 1.364322] cfg80211: World regulatory domain updated:
[ 1.960541] Bluetooth: fffffffcf9533d78
[ 2.186937] Bluetooth: fffffffcf9533d48
[ 2.186943] Bluetooth: fffffffcf9533d48Bluetooth: fffffffcf9533d68
[ 2.186964] Bluetooth: fffffffcf9533d28Bluetooth: fffffffcf9533d28
[ 2.186975] Bluetooth: fffffffcf9533d08Bluetooth: fffffffcf9533d78
[ 2.186987] Bluetooth: fffffffcf9533d58<6>[ 2.187022] l2tp_core: L2TP core driver, V2.0
[ 4.670332] init: /vendor/etc/init/hw/init.qcom.rc: 576: ParseTriggers() failed: unexported property trigger found: ro.bluetooth.ftm_enabled
[ 4.695718] init: Parsing file /vendor/etc/init/android.hardware.bluetooth@1.0-service-qti.rc...
[ 7.909464] init: starting service 'vendor.bluetooth-1-0-qti'...
[ 7.934887] init: Command 'mkdir /persist/bluetooth 0770 bluetooth bluetooth' action=boot (/vendor/etc/init/hw/init.qcom.rc:176) took 0ms and failed: mkdir() failed: Read-only file system
[ 21.241687] bluetooth_power: bt_power gpio config failed
phablet@ubuntu-phablet:~$

c4pp4

@sladek9
Just for sure. Did you install UT via ubports-installer with downloaded default vendor.img?

Sladek9

@c4pp4 Yes. I downloaded the vednor.img from the link in the ubports installer and then uploaded it manually. The only thing is that I downloaded the vendor.img in the latest version of ubports installer, but the intsallation itself was done in the older version - 0.88 I guess.
It was necessary due to the fact that the latest uboports installer did allow selecting the downloadad vendor.img in the file picker, but nothing happened then (button next did not respond). The version 0.88 worked fine. I had to use DEB package, because in SNAP package, the installer always crashed when trying to select the vendor.img in file picker.
I do not know if this procedure might bring any problems, but I do not think so, because it installed the latest version of UT successfully without any complaints.

c4pp4

@sladek9
try:

sudo stop bluebinder
rfkill list bluetooth
sudo start bluebinder
rfkill list bluetooth

here is output from my device:

Sladek9

@c4pp4 Still no hci0 unfortunately. Output is below:

phablet@ubuntu-phablet:~$ sudo stop bluebinder
[sudo] password for phablet:
bluebinder stop/waiting
phablet@ubuntu-phablet:~$ rfkill list bluetooth
0: bt_power: Bluetooth
Soft blocked: no
Hard blocked: no
phablet@ubuntu-phablet:~$ sudo start bluebinder
bluebinder start/running, process 10005
phablet@ubuntu-phablet:~$ rfkill list bluetooth
0: bt_power: Bluetooth
Soft blocked: no
Hard blocked: no
phablet@ubuntu-phablet:~$

It is strange, because it has worked until today in the morning.

c4pp4

@sladek9 Have you restarted your device in the morning or what?
BTW: I have the same output of 'dmesg | grep -i blue'

Sladek9

@c4pp4 If I restart, then the hci0 goes on. But when I go to the settings to search for any device to connect, the hci0 goes out. So it seems going to the settings is breaking it.

danilo748

Up!

any news?
has anyone solved the problem?

Nreal

@danilo748
It doesnt work here either.
Mobile network is having issues too.
Cannot use my nextcloud..

wilfridd

@danilo748 hi! Seems that BT and Wifi are linked together.
I've recently noticed that BT if not working anymore if you switch off WIFI. Switching back on Wfi + A device restart is needed to have BT working again, or maybe at least a netword service restart with command line.

Nreal

@nauvpp Ti doesnt seem to make any difference if wifi is on or of here.

wilfridd

@nreal here's what "rfkill list" shows on my device
0: bt_power: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no

danilo748

I change the channel from stable to devel and now th BT works!

Nreal

@danilo748 I tried that too, didnt work here

wilfridd

@nreal Theses steps to reproduce :
WIFI is on and BT is on = OK, can see devices. BT off then on again = OK, can see devices.
Set WIFI off = BT goes OFF itself few seconds after WIFI.

Set WIFI back on = BT stays off.
Restart is needed to get BT back on too.
If you can repoduce, I will file a bug.

Nreal

@nauvpp I have Xiaomi MI A2 and bluetooth does nothing, with or without wifi on / off.

danilo748

@nreal Infact! my BT is down again.
After every update it becomes active again but, for some reason, after i use it for some time it come off again.

wilfridd

@nreal Sorry I'm not sure to understand well. You mean BT is not working at all on your MiA2 ?

danilo748

When BT goes down (BT device list became empty and the icon disappeared), it seems like you can fix it with following steps.

Activate WIFI
Activate BT
Restart the device

Step 3 has to be quick before BT switches off again.
I've tried multiple times and it's ok for me.