- #Windows bluetooth battery status blank serial
- #Windows bluetooth battery status blank driver
- #Windows bluetooth battery status blank Pc
The Bluetooth radio is expected to have a very low power consumption-less than one milliwatt-in the Sleep (D2) state if no devices are connected through RF links.
Only paired Bluetooth HID device are allowed to wake the system during modern standby. To support wake from modern standby on Bluetooth-attached HID input devices, the radio stays in the Sleep (D2) state and is armed for wake. Instead, the Bluetooth radio is transitioned in and out of the Sleep (D2) state based on idle time-outs that are managed by BthPort. The Bluetooth radio does not enter a special power management mode when the system enters modern standby.
#Windows bluetooth battery status blank driver
The Windows Bluetooth driver stack requires that a Bluetooth radio support the following three device power states:ĭevice power management for a Bluetooth radio is expected to operate in a consistent way across all system power states. To control the hardware, the driver uses a combination of in-band bus communication, coordination with the power-engine plug-in (PEP), and/or out-of-band signaling through GPIO pins.īluetooth radio devices typically support multiple low-power modes, some of which may be proprietary to the device itself. In the case of UART, an additional vendor-provided transport bus driver coordinates requests from BthPort to the Bluetooth radio device over the system-specific bus connection. In the case of USB, this is done through USB Selective Suspend via the USB host controller. BthPort works in conjunction with a corresponding transport-specific driver (UART or USB) to appropriately drive the radio into the desired power state. Just as in typical Windows driver stacks, the Bluetooth radio power policy is managed by a single power policy owner (PPO) - specifically BthPort (bthport.sys). Currently, Microsoft verifies modern standby compatibility only for Bluetooth radios that are connected to UARTs or USB, or are integrated into a System on a Chip (SoC)). (In theory, the Bluetooth transport bus driver model that was introduced in Windows 8 should support any underlying communication bus.
#Windows bluetooth battery status blank serial
On hardware platforms that support the modern standby power model, Windows supports Bluetooth radios that are connected to UARTs or to Universal Serial Bus (USB). In a Windows system, how the power state of the Bluetooth radio device is managed depends on the bus to which the radio is connected. In a modern standby PC, the driver for a Bluetooth radio should manage this device's power states according to the guidelines presented in this article.
#Windows bluetooth battery status blank Pc
A Bluetooth radio device enables short-range RF communication between a PC and an input device, an audio device, or other Bluetooth-attached user peripheral.
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