Symptoms
- The Razer Hammerhead True Wireless earbuds can work with most devices with Bluetooth audio capability. This product is designed to work with mobile devices. However, if your PC has Bluetooth audio capabilities, the Razer Hammerhead True Wireless earbuds may work with it.
- Bluetooth Network Adapter: Control Panel - Network and Sharing Center - Change Adapter Settings The Bluetooth Network Connection is Enabled but Not connected; The Device Manager has 2 Bluetooth entries: Asus Bluetooth: Properties inform me This device is working properly and the best driver software for your device is already installed.
Razer Bluetooth Devices Driver
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After not using your Bluetooth mouse or keyboard for some time, you may not be able to use the device again without rebooting the system or turning your Bluetooth radio off and back on. This article applies to your symptoms if the following conditions are also true:
Your computer has a Bluetooth radio
The Windows option 'Allow the computer to turn off this device to save power' is set.
The keyboard or mouse is Bluetooth 2.0, 2.1, 3.0, or 4.0.
You can check these settings by doing the following:
Windows 10:
Right-click on Start, and select Device Manager.
In Device Manager, click the arrow next to Bluetooth, and select the Bluetooth radio.
Right-click the Bluetooth radio and select Properties.
Select the Power Management tab, and see if there is a check next to Allow the computer to turn off this device to save power.
Windows 8:
1. Select the Search charm and type Device Manager.
2. Select Settings. Device Manager should be listed in the results. Click on Device Manager.
3. In Device Manager, expand Bluetooth and select the Bluetooth radio.
4. Right-click on the Bluetooth radio and select Properties.
5. On the Power Management tab, Allow the computer to turn off this device to save power is enabled if the checkbox is checked.
Windows 7:
1. Click the Start button and type Device Manager in the Search box.
2. Click on Device Manager in the Results window.
3. In Device Manager, expand Bluetooth and select the Bluetooth radio.
4. Right click on the Bluetooth radio and select Properties.
5. On the Power Management tab, Allow the computer to turn off this device to save power is enabled if the checkbox is checked.
This section describes the class-of-device (CoD) registry subkeys and entries that apply to the Bluetooth driver stack.
'COD Major' and 'COD Type' Values
Original equipment manufacturer (OEMs) can use the COD Major and COD Type values to indicate the Class of Device for a Bluetooth-enabled Windows device. After the Bluetooth class installer sets the Class of Device based on these registry values, a remote device can determine whether it is connecting to a portable computer, a desktop computer, a phone, and so on.
The registry path to the COD Major and COD Type values is:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesBTHPORTParameters
Note that setting these values changes the Bluetooth Class of Device for the system, regardless of which Bluetooth radio may be attached. You can set the COD Major and COD Type to DWORD values as defined for the Class of Device field values in the Bluetooth SIG Assigned Numbers.
Razer Bluetooth Driver
The Bluetooth profile driver, BthPort.sys, reads the COD Major and COD Type values to determine how it should respond to a device inquiry. These values affect only the COD_MAJOR_XXX and COD_XXX_MINOR_XXX bits of the Class of Device. The COD_SERVICE_XXX bits are not affected by this registry entry.
If the COD Major and COD Type values are not set or are set to invalid values, the Bluetooth class installer will set these values to COD_MAJOR_COMPUTER and COD_COMPUTER_MINOR_DESKTOP, respectively.
Scanning Parameterization Settings
Razer Bluetooth Devices Drivers
Profile drivers can specify scanning parameters settings for their device(s) in their profile driver's INF file to tailor to the specific needs of a given device scenario.
You can override the default system scanning parameters by providing one or more of the following scanning parameters listed below into the AddReg directive. More information on how to use this directive can be found in INF AddReg Directive.
| Value Name | Type | Min Value | Max Value |
|---|---|---|---|
| HighDutyCycleScanWindow | DWORD 0x10001 | 0x0004 | 0x4000. Shall be equal or smaller than the HighDutyCycleScanInterval parameter |
| HighDutyCycleScanInterval | DWORD 0x10001 | 0x0004 | 0x4000 |
| LowDutyCycleScanWindow | DWORD 0x10001 | 0x0004 | 0x4000. Shall be smaller than the LowDutyCycleScanInterval parameter |
| LowDutyCycleScanInterval | DWORD 0x10001 | 0x0004 | 0x4000 |
| LinkSupervisionTimeout | DWORD 0x10001 | 0x000A | 0x0C80 |
| ConnectionLatency | DWORD 0x10001 | 0x0000 | 0x01F4 |
| ConnectionIntervalMin | DWORD 0x10001 | 0x0006 | 0x0C80. Shall be smaller or equal to ConnectionIntervalMax |
| ConnectionIntervalMax | DWORD 0x10001 | 0x0006 | 0x0C80 |
Note
Changes to scanning parameters make a global impact on the performance of the Bluetooth stack. Making changes to scanning parameters programmatically is not permitted. Using Low Duty Cycle scanning parameters that are too aggressive can not only have a negative impact to the available bandwidth for other Bluetooth Low Energy connections, but also for Bluetooth BR/EDR connections.