Written by: algebnaly
Date: 2025-11-27T03:08:32.000Z
DDC（Display Data Channel）是电脑和显示器通信的基础标准， CI（Command Interface）是DDC的扩展，用于向显示器发送控制指令。 Linux上提供了ddcutil来操作DDC/CI。 VCP（Virtual Control Panel）是DDC/CI定义的一系列控制代码。
为了控制显示器，我们得先看看显示器是否支持DDC/CI, 以及具体支持哪些VCP代码。
Linux上可以使用如下命令查看显示器的VCP版本信息
ddcutil detect其输出类似如下
Display 1
I2C bus: /dev/i2c-5
DRM_connector: card1-HDMI-A-1
EDID synopsis:
Mfg id: XXX
Model: XXX
Product code: XXX
Serial number: XXX
Binary serial number: XXX
Manufacture year: 2020, Week: 10
VCP version: 2.1
Display 2
I2C bus: /dev/i2c-6
DRM_connector: card1-DP-1
EDID synopsis:
Mfg id: XXX
Model: XXX
Product code: XXX
Serial number: XXX
Binary serial number: 1 (0x00000001)
Manufacture year: 2023, Week: 1
VCP version: 2.2接着，我们可以看看某个显示器的VCP的功能:
ddcutil --bus=6 capabilities
Model: XXX
MCCS version: 2.2
Commands:
Op Code: 01 (VCP Request)
Op Code: 02 (VCP Response)
Op Code: 03 (VCP Set)
Op Code: 07 (Timing Request)
Op Code: 0C (Save Settings)
Op Code: E3 (Capabilities Reply)
Op Code: F3 (Capabilities Request)
VCP Features:
Feature: 02 (New control value)
Feature: 04 (Restore factory defaults)
Feature: 05 (Restore factory brightness/contrast defaults)
Feature: 06 (Restore factory geometry defaults)
Feature: 08 (Restore color defaults)
Feature: 0B (Color temperature increment)
Feature: 0C (Color temperature request)
Feature: 10 (Brightness)
Feature: 12 (Contrast)
Feature: 14 (Select color preset)
Values:
01: sRGB
02: Display Native
04: 5000 K
05: 6500 K
06: 7500 K
08: 9300 K
0b: User 1
Feature: 16 (Video gain: Red)
Feature: 18 (Video gain: Green)
Feature: 1A (Video gain: Blue)
Feature: 52 (Active control)
Feature: 60 (Input Source)
Values:
01: VGA-1
03: DVI-1
0f: DisplayPort-1
11: HDMI-1
Feature: 87 (Sharpness)
Feature: AC (Horizontal frequency)
Feature: AE (Vertical frequency)
Feature: B2 (Flat panel sub-pixel layout)
Feature: B6 (Display technology type)
Feature: C6 (Application enable key)
Feature: C8 (Display controller type)
Feature: CA (OSD/Button Control)
Feature: CC (OSD Language)
Values:
01: Chinese (traditional, Hantai)
02: English
03: French
04: German
06: Japanese
0a: Spanish
0d: Chinese (simplified / Kantai)
Feature: D6 (Power mode)
Values:
01: DPM: On, DPMS: Off
04: DPM: Off, DPMS: Off
05: Write only value to turn off display
Feature: DF (VCP Version)
Feature: FD (Manufacturer specific feature)
Feature: FF (Manufacturer specific feature)我们可以看到这台显示器支持很多的VCP，以控制亮度为例，我们可以看到，VCP Feature 10是Brightness,也就是亮度，于是我们可以使用如下命令来获取亮度，
ddcutil --bus=6 getvcp 10
VCP code 0x10 (Brightness ): current value = 20, max value = 100可以看到我的显示器当前的亮度为20, 最大值为100。 我们可以使用如下命令来设置亮度
ddcutil --bus=6 setvcp 10 30其它的VCP设置也是类似的方法调整。