In-call speaker volume fixed too "low" while smartwatch connected via Bluetooth When my smartwatch (a cheap noname MTK 6260A device probably running Nucleus (most likely a clone of the ZGPax S29), and controlled by the BTNotification app on my Android device) is connected to my LG P880 (running CyanogenMod Kitkat 4.4.4), and I receive or make a call, volume is quite low – I hardly can hear the other side. Volume rockers seem to have no effect (maybe connected to Volume Rocker only controls Bluetooth In-call Volume; cannot control all other volumes which I just found – need to check that with the next call I make). I didn't have that issue before I got and connected the smartwatch.

My guess is it is …


the reason of the linked question (volume rockers bound to bluetooth)
that funny "max volume ear protection" we had mentioned here a couple of times


Apart from switching Bluetooth off whenever there's a call in progress (which I probably could do with tasker):


  Is there any way I could increase volume (or get the rocker off the Bluetooth part and back to the built-in "ear speaker" to control/raise the volume)?


Note that audio is not routed to Bluetooth (I've explicitly disabled that, as otherwise everyone around would hear the other side via the speakers of my smartwatch), call volume is already set to 100% – and yes, I've checked with Settings › Audio already. Also, I've already checked with …


How to set in-call volume
How do I disconnect Bluetooth headset while in call (different issue)
Disable calls through Bluetooth smartwatch but show call status (remotely related, but no answer)
Why does the in-call volume change on its own on my Samsung Galaxy S3? might be related (that BTNotifier stuff really is a bit buggy), but there's no update to BTNotifier available (in fact, I had to sideload the app from the manufacturer's site as the playstore version doesn't work with the watch)
Uninstall the BT notification. By uninstalling it, the volume on the smartwatch will return to normal function, the best it will be.

The only other way is to install a volume booster from the Play Store.