[4.2.2] Bluetooth stopped working

[Guest xeros2]

Did anyone got such issue that bluetooth "just stopped working"?

When I try to enable it it's getting disabled in few secs.

What I've found it's getting enabled in configuration (1 value for "bluetooth_on" in /data/data/com.android.providers.settings/databases/settings.db "system" table) but in menu it's still disabled and doesn't search for devices and it's not reachable.

Other things that I've found (compared to backup with BT working) is that MAC address in "secure" table has been reset to 00:00:00:00:00:00 but even after changing it back to proper one it's still not working with the same result.

In dmesg I found suspicious text:

<5>[  571.378340] (0)[1:init]init: starting 'bt_mac'
<6>[  571.378787] (0)[1:init]init: PropSet [init.svc.bt_mac:running] Start>>
<6>[  571.378933] (0)[1:init]init: PropSet [init.svc.bt_mac:running] Done
<7>[  571.402719] (0)[9002:write_bt_mac][exec] /system/bin/write_bt_mac(3)
<7>[  571.448608] (1)[9002:write_bt_mac][9002:9002:write_bt_mac] exit
<7>[  571.448893] (1)[9002:write_bt_mac][9002:write_bt_mac] sig 17 to [9000:sh]

but googling didn't show anything for such exit signal from this process.

Setting "bluetooth_on" to "0" in "system" table and reboot makes logs outputs a bit better for first attempt to enable BT (at first sight they look like it should work), but it still gets disabled afterwards.

I have checked /data/nvram files for BT and /data/@btmtk and there it looks similar to backup and nothing useful in /proc & /sys to check from kernel side.

I was thinking about some hardware problems as I've been using BT for connection to car engine computer few times for 7-8h/day of car driving and it seams it might have stopped working when I tried it once more or it could have been some unplanned phone reboot due to hang of launcher/app.

Other than that, everything else works fine (just this BT isn't working).

 

Just for info - I didn't try to clean data & ROM reflash - I've got used to repair broken things instead going easy way & start configuration/reinstallation from scratch (I have almost 300 apps & many of them are tightly integrated with system and specially configured that backup restore wouldn't be so easy in my case).

 

Did anyone have such problem also and what was resolution for it?

Edited August 30, 2015 by xeros2

[Guest 77chedu]

Flashing another rom might be still the fastest way to discard a hardware problem. You'd stil have your backup, so no harm done