The lspci is useful for showing all the information about system PCI buses and the devices connected to them.
Your most common options are:
# lspci
0000:00:00 .0 Host bridge: Intel Corp. 440BX/ZX/DX – 82443BX/ZX/DX Host bridge (rev 01)
0000:00:01 .0 PCI bridge: Intel Corp. 440BX/ZX/DX – 82443BX/ZX/DX AGP bridge (rev 01)
0000:00:07 .0 ISA bridge: Intel Corp. 82371AB/EB/MB PIIXB 4 ISA (rev 08)
00:00:07 .1 IDE interface: Intel Corp. 82371AB/EB/MB PIIX4 IDE (rev 01)
0000:00:07 .2 USB Controller: Intel Corp. 82371AB/EB/MB PIIX4 USB
0000:00:07 .3 Bridge: Intel Corp. 82371AB/EB/MB PIIX4 ACPI (rev 08)
The Linux Kernel has a robust hardware recognition system and support for various devices. This system was implemented mainly through sysfs, udev, and d-bus.
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