USBPcap and usbmon debugging: what to collect before blaming firmware (opens in new tab)

USB bugs are easy to describe badly. The device is not detected. The HID report is wrong. The endpoint stalls. It works on one machine but not another. The firmware team says the host is wrong. The host team says the firmware is wrong. The fastest way out is to collect evidence at the USB transfer level. On Windows, that often means USBPcap. On Linux, that often means usbmon. The capture alone is only the beginning; the useful work is turning that capture into a readable explanation. Start wi...