[ControlFlags] ExcludeFromSelect = *
The device identified by USB VID 214B and PID 7250 is an example of a product that implements the AMPR specification. This device is designed to provide high-quality audio and multimedia performance, with features such as low latency, high-speed data transfer, and compatibility with a wide range of operating systems.
The AMPR (Audio Multimedia Product Reference) is a new reference design for USB audio and multimedia devices. The AMPR is a comprehensive specification that defines the requirements for USB devices that handle audio and multimedia data. The AMPR is designed to ensure that USB devices from different manufacturers can work seamlessly with each other and with a wide range of operating systems.
[Computer] ──(USB 2.0 Bus)──> [Error: Device Descriptor Request Failed] │ └──> Missing Generic Hub Driver └──> Insufficient USB Bus Power └──> Physical Cable Degradation Common culprits behind this issue include:
You should see an output line similar to: usb vid214b amppid7250 amprev0100 new
: The device firmware revision or stepping version (v1.00). What is this physical device?
Points specifically to the HS8836A 4-Port Hub controller chip .
The HS8836A splits a single host port. If connected to an unpowered passive port (like a laptop edge connector or a Raspberry Pi hub link), it can only pull a maximum of . Hanging power-hungry devices—like external 2.5" mechanical hard drives or USB Wi-Fi dongles—off the hub causes the voltage rail to sag, precipitating device resets.
: Assigned to Huasheng Electronics , a widely used manufacturer of mass-market USB hub controllers. The AMPR is a comprehensive specification that defines
Troubleshooting and Understanding the USB\VID_214B&PID_7250&REV_0100 Hardware Identifier
USB hub only recognised intermittently - Raspberry Pi Forums
Switch the drop-down configurations for both On Battery and Plugged In to . Click Apply and then OK . Step 3: Modify Device Manager Power Properties Return to the Device Manager application.
: I am the first of my kind, the original blueprint. What is this physical device
Unplug power-hungry accessories. If the hub features an auxiliary 5V power port, connect an external power supply to relieve the load on your computer's motherboard bus. Fix 3: Clear the Windows Device Stack
A: This points to a hardware or port-specific difference. The USB port on the non-working computer might be older or provide less power. Test the hub on a different USB port on that computer, especially one directly on the motherboard (back of desktop) rather than a front-panel or extension port.
If you are searching for this string, you likely encountered an error in the Windows Device Manager (where it may appear as an "Unknown USB Device" with a yellow exclamation mark) or a Linux dmesg log showing enumeration failures. Use these steps to resolve performance or connection drops.
: Indicates the hardware version (v1.00) of the controller chip. Typical Use Cases & Components
: Many desktop motherboards, laptops, and monitors feature integrated Huasheng/Ameco internal USB splitters . This allows a single physical USB trace coming from the CPU to branch into multiple internal ports for devices like built-in webcams, Bluetooth cards, or front-panel ports.
: Passive USB switches and hubs draw power directly from the host computer's motherboard. If you attach multiple high-draw devices (like external hard drives or RGB mechanical keyboards) to the hub, the controller chip may brownout, drop connection, or fail to report its hardware ID properly.