Qualcomm Atheros AR3012 Driver bluetooth issue for Windows 10 laptop

 If you're having issues with this adapter'a driver this may work for you.

1. You have to uninstall the Windows drivers by right clicking the Windows button and selecting "Device Manager", once there click the left > arrow to expand the menu.

2. Right click "Qualcomm Atheros AR3012 Bluetooth(R) Adapter", click "Uninstall device" and make sure you enable the checkbox for "Delete the driver software for this device.".

Click the "Uninstall" button. Once the device is uninstalled you may reboot the PC.

3. Then download the driver from here: https://www.catalog.update.microsoft.com/home.aspx

4. Search for this:

Qualcomm Atheros Communications - Bluetooth Controller - Qualcomm Atheros AR3012 Bluetooth 4.0 + HS

Find the Version 10.0.1.11 640KB

Download the file, the name should be 20920672_15ae0e026fb48dda2b6229e4db0770e80d5a17b9.cab

5. Extract the file contents into a folder, you can use WINRAR for that.

6. Go back to the device manager from Step 1

Right click the bluetooth adapter option and select "Update Driver", Click "Browse my computer for drivers" and click the Browse button, find the folder with the drivers you just extracted and click the OK button, the driver should be installed now, try using bluetooth or reboot and try using it now.

Hope it helps.

UPDATE: Even after doing all this I found that it is a power issue where the device gets stuck on D2 state, one workaround for this is to put the computer in sleep mode and wake it up again.

You can also try to disable the power management option in Device Manager, make sure "Allow this computer to turn off this device to save power" is not checked, you can find it either in the adapter properties or Human Interface Devices (Bluetooth HID device).