What is the use of the setpci command in Linux

Editor to share with you what is the use of the setpci command in Linux, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Linux common commands the setpci command is a tool for querying and configuring PCI devices.

Setpci query and configure tools for PCI devices

Syntax setpci (options) (parameters) option-v: displays details of instruction execution;-f: does not display any information when nothing needs to be done;-D: test mode, which does not really write configuration information to the register;-d: displays only the information of a given manufacturer and device;-s: displays only the function block information on the specified bus, slot, or device. Parameter PCI device: specify the PCI device to configure

Action: specify the configuration operation to be completed.

Example how to adjust the brightness of notebook screen under Linux:

First enter the terminal and enter the lspci command to list the addresses of various devices:

Lspci 00Rom 00.0 host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03) 00RU 02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) 00RU 02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME 943/940GML Express Integrated Graphics Controller (rev 03) 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 02). It is found that 00Rom 02.0 is a VGA device, so we modify its properties:

Sudo setpci-s 00 02.0 F4.B=FF explain:

Setpci is a command that modifies device properties.

-s indicates that the next input is the address of the device.

00 02.0 VGA device address (:.).

The address of the attribute to be modified by F4, which should indicate "brightness".

B modified length (B should be bytes (Byte), w (should be Word, two bytes), L (should be Long,4 bytes).

= the value to be modified by FF (can be changed).

Here 00 is the darkest, FF is the brightest, different computers may be different. For example, if I think FF is too bright, I can:

Sudo setpci-s 00Linux 02.0 F4.B=CC and above are all the contents of this article entitled "what is the use of setpci commands in Linux?" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!