- sr_err("failed to write %d bytes via ctrl-out %d %#x, %d: %s.",
- wLength, bRequest, wValue, wIndex,
- libusb_error_name(ret));
+ sr_dbg("USB ctrl out: %d bytes, req %d val %#x idx %d: %s.",
+ wLength, bRequest, wValue, wIndex,
+ libusb_error_name(ret));
+ sr_err("Cannot write %d bytes to USB: %s.",
+ wLength, libusb_error_name(ret));