USB Device Registry Entries
This topic describes the device-specific registry entries.
Find device information after it enumerates on Windows
View the device interface GUID, Hardware Id, and device class information about your device
- Find this registry key and note the DeviceInstance value:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceClasses\
- Find the device instance registry key and get the device interface GUID:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\<hardware id>\<instance id>\Device Parameters
- Under the device instance key, note the device class, subclass, and protocol codes:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB
Registry settings for configuring USB driver stack behavior
The registry entries described in this topic are found under this key:
HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Control usbflags <VVVVPPPPRRRR> <Device-specific registry entry>
In the vvvvpppprrrrr key,
- vvvv is a 4-digit hexadecimal number that identifies the vendor
- pppp is a 4-digit hexadecimal number that identifies the product
- rrrr is a 4-digit hexadecimal number that contains the revision number of the device.
The following table describes the possible registry entries for the vvvvpppprrrrr key. The USB driver stack considers these entries as read-only values.
| Registry entry | Description | Possible values |
|---|---|---|
|
osvc REG_BINARY Supported on Windows XP and later versions. |
Indicates whether the operating system queried the device for Microsoft-Defined USB Descriptors. If the previously-attempted OS descriptor query was successful, the value contains the vendor code from the OS string descriptor. |
|
|
IgnoreHWSerNum REG_BINARY Supported on Windows Vista and later versions. |
Indicates whether the USB driver stack must ignore the serial number of the device. |
|
|
ResetOnResume REG_BINARY Supported on Windows Vista and later versions. |
Indicates whether the USB driver stack must reset the device when the port resumes from a sleep cycle. |
|
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