如何通过DDC / IC更改外部监视器的亮度？

我想通过DDC / IC（DDC Wikipedia）更改外部Dell U2713HM显示器的亮度，该显示器通过DisplayPort连接。我有集成的Intel HD4000图形卡。

当我运行sudo get-edid时，我得到：

get-edid: get-edid version 2.0.0

Performing real mode VBE call
Interrupt 0x10 ax=0x4f00 bx=0x0 cx=0x0
Function supported
Call successful

VBE version 300
VBE string at 0x11100 "Intel(R) Sandybridge/Ivybridge Graphics Chipset Accelerated VGA BIOS"

VBE/DDC service about to be called
Report DDC capabilities

Performing real mode VBE call
Interrupt 0x10 ax=0x4f15 bx=0x0 cx=0x0
Function supported
Call successful

Monitor and video card combination does not support DDC1 transfers
Monitor and video card combination supports DDC2 transfers
0 seconds per 128 byte EDID block transfer
Screen is not blanked during DDC transfer

Reading next EDID block

VBE/DDC service about to be called
Read EDID

Performing real mode VBE call
Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
Function supported
Call successful

��������@L628�<"x:K��VK�%
PT�K���qO�@��V^���)P0 5UP!�GK0KD281826L
�DELL U2713HM
�1Vq
EDID claims 1 more blocks left


*********** Something special has happened!
Please contact the author, Matthew Kern
E-mail: pyrophobicman@gmail.com
Please include full output from this program (especially that to stderr)



Reading next EDID block

VBE/DDC service about to be called
Read EDID

Performing real mode VBE call
Interrupt 0x10 ax=0x4f15 bx=0x1 cx=0x0
Function supported
Call successful

  ��������@L628�<"x:K��VK�%
PT�K���qO�@��V^���)P0 5UP!�GK0KD281826L
�DELL U2713HM
�1Vq
EDID claims 1 more blocks left
EDID blocks left is wrong.
Your EDID is probably invalid.

重要的部分可能是：

Monitor and video card combination supports DDC2 transfers

键盘上的亮度键正常工作，因为我在Ubuntu 12.10中看到了背光更改通知。

如何通过软件调整亮度？

谢谢您的回答。

您可以在这里找到必要的文件：https : //packages.debian.org/unstable/ddccontrol

ddccontrol
libddccontrol
ddccontrol-db

我必须安装。然后，我必须运行以下命令：

sudo modprobe i2c-dev
sudo modprobe intelfb
sudo chmod a+rw /dev/i2c-*

现在，我可以使用以下命令将亮度更改为代表外部显示器的背光亮度的值（此处为53），而无需使用屏幕显示：

ddccontrol -p -r 0x10 -w 53

现在，我仍然需要从我的键盘上将我的特殊亮度键链接到亮度命令（注意最大亮度级别）。知道怎么做吗？

ddccontrol自2006年以来，以@remi的答案为基础，似乎没有得到维护，也没有为任何新显示器添加配置。

幸运的是，有一个更新的工具：ddcutil，它更加健壮并积极开发。在安装了一个预构建的软件包或从源代码构建之后，它可以用于查询和设置亮度（还有许多其他设置）：

# ddcutil capabilities | grep Brightness
Feature: 10 (Brightness)
# ddcutil getvcp 10
VCP code 0x10 (Brightness                    ): current value =    60, max value =   100
# ddcutil setvcp 10 70