VOID DeviceIoControl( WDFQUEUE Queue, WDFREQUEST Request, size_t OutputBufferLength, size_t InputBufferLength, ULONG IoControlCode ) BRIGHTNESS_REQUEST* req; WDFMEMORY memory;
Right-click it and choose Update driver > Search automatically for drivers . brightness driver for windows 11
Example user-mode C# code using P/Invoke: VOID DeviceIoControl( WDFQUEUE Queue
Start with the generic Device Manager reinstall. Move to the OEM ACPI packages for your laptop brand. If you are on an external monitor, embrace DDC/CI tools. And if all else fails, a clean boot of Windows 11 with the official drivers from —downloaded directly, never through third-party driver updaters—will restore your control. ULONG IoControlCode ) BRIGHTNESS_REQUEST* req
Sometimes the "Monitor" driver or "Ambient Light Sensor" is the culprit. Enable Monitors Device Manager