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LSPCI

Lspci is a command-line utility in Linux and Unix operating systems that is used to display information about all the PCI (Peripheral Component Interconnect) buses and devices connected to the system. It provides detailed information about the hardware components, including their vendor and device IDs, subsystems, and other attributes. The lspci command is often used for diagnosing hardware-related issues and identifying the specific hardware components installed in a system.

How to use LSPCI

Here is an example of using the lspci command in a Linux terminal:

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$ lspci
00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 07)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Desktop)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:14.0 USB controller: Intel Corporation 200 Series/Z370 Chipset Family USB 3.0 xHCI Controller
00:14.2 Signal processing controller: Intel Corporation 200 Series PCH Thermal Subsystem
...

This output shows information about various hardware components in the system, including the vendor and device IDs, the device type, and the revision number.

Show details about devices

To show detailed information about a specific device using lspci, you can specify the device’s bus address using the lspci -s option.

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$ lspci -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Desktop) (rev 02)
        Subsystem: ASRock Incorporation Device 3977
        Flags: bus master, fast devsel, latency 0, IRQ 131
        Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
        Memory at 90000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 5000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

This output shows detailed information about the VGA compatible controller, including its subsystem, memory addresses, I/O ports, and kernel driver.

Verbose output of lspci

The -v (verbose) and -vv (very verbose) parameters in lspci are used to increase the level of detail in the output.

• The -v option provides additional information about the devices, including the vendor and device IDs, subsystem IDs, and more. • The -vv option provides even more detailed information, including the device’s capabilities, IRQ settings, and ASPM (Active State Power Management) settings.

For example, to show the ASPM settings for the PCI Express device with bus address 00:1c.0, you can run the following command:

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$ lspci -s 00:1c.0 -vv | grep -i aspm
                ASPM L1 Enabled; L0s Enabled

Most useful commands

Command Description
lspci List all PCI devices in the system.
lspci -v List all PCI devices in the system with verbose output, including vendor and device IDs, subsystem IDs, and more.
lspci -vv List all PCI devices in the system with very verbose output, including device capabilities, IRQ settings, and ASPM (Active State Power Management) settings.
lspci -s <bus_address> Display information for a specific PCI device with the specified bus address.
lspci -k Show kernel driver in use for each device.
lspci -n Show numeric IDs for vendor and device instead of names.
lspci -nn Show numeric IDs for vendor, device, subsystem vendor, and subsystem device instead of names.
lspci -t Display a tree-like diagram of the PCI bus hierarchy.
lspci -D Show only PCI devices that are not behind a bridge.
lspci -H1 Show device numbers in hexadecimal format instead of decimal.
lspci -x Show hex dump of the PCI configuration space for each device.