What information can the lspci command display about the system hardware?

The lspci command can display information about the system hardware, such as:

Device IRQ settings1: The lspci command can show the interrupt request (IRQ) number assigned to each device by using the -v option. The IRQ number indicates how the device communicates with the CPU.

PCI bus speed2: The lspci command can show the speed of the PCI bus by using the -vv option. The speed is expressed in megahertz (MHz) or gigahertz (GHz) and indicates how fast the data can be transferred between the device and the bus.

Device vendor identification3: The lspci command can show the name and identification number of the device vendor by using the -n or -nn option. The vendor identification helps to identify the manufacturer and model of the device.

References: 1: https://www.man7.org/linux/man-pages/man8/lspci.8.html  2: https://phoenixnap.com/kb/lspci-command  3: https://en.wikipedia.org/wiki/Lspci