在Linux中,如何判断计算机的监视器是否从命令行打开/关闭?我传统上认为监视器是只输出的设备,但我注意到Gnome监视器首选项对话框具有“检测监视器”功能。这是否可以推广到确定监视器是否被物理关闭?
发布于 2010-08-12 03:17:56
VESA DDC连接是可用于查询监视器是否存在的I2C连接。
Linux exposes the I2C device和userland程序可以通过http://jaffar.cs.msu.su/oleg/ddcci/之类的代码直接与监视器通信
注意下面的内容:Control 0xe1: +/1/1 [SAM: Power control (0 - off/1 - on)]
# ddcci-tool /dev/i2c-2 -e -c -d
ddcci-tool version 0.03
Reading EDID : 0x50@/dev/i2c-2
Plug and Play ID: SAM00BA
Input type: Analog
Using ddc/ci : 0x37@/dev/i2c-2
Capabilities:
(type(LCD)vcp(04 05 10 12 60(1 3) B0(1 2) B6 C6 C8 C9 D6(1 4) DC(1 2 3 4) DF))
Controls (valid/current/max):
Control 0x04: +/0/1 [Reset Factory Defaults]
Control 0x05: +/0/1 [SAM: Reset Brightness and Contrast]
Control 0x06: +/0/1 [Reset Factory Geometry]
Control 0x08: +/0/1 [Reset Factory Default Color]
Control 0x0e: +/60/120 [SAM: Image Lock Coarse]
Control 0x10: +/0/100 [Brightness]
Control 0x12: +/50/100 [Contrast]
Control 0x16: +/8/16 [Red Video Gain]
Control 0x18: +/8/16 [Green Video Gain]
Control 0x1a: +/8/16 [Blue Video Gain]
Control 0x1e: +/0/2 [SAM: Auto Size Center]
Control 0x20: +/50/100 [Horizontal Position]
Control 0x30: +/25/54 [Vertical Position]
Control 0x3e: +/39/50 [SAM: Image Lock Fine]
Control 0x60: +/1/3 [Input Source Select]
Control 0x62: +/0/100 [Audio Speaker Volume Adjust]
Control 0x6c: +/140/255 [Red Video Black Level]
Control 0x6e: +/127/255 [Green Video Black Level]
Control 0x70: +/121/255 [Blue Video Black Level]
Control 0xb0: +/0/2 [Settings]
Control 0xb6: +/3/8 [???]
Control 0xc6: +/1/1 [???]
Control 0xc8: +/5/16 [???]
Control 0xc9: +/1/0 [???]
Control 0xca: +/2/2 [On Screen Display]
Control 0xcc: +/2/11 [SAM: On Screen Display Language]
Control 0xd6: +/1/4 [SAM: DPMS control (1 - on/4 - stby)]
Control 0xdc: +/4/4 [SAM: MagicBright (1 - text/2 - internet/3 - entertain/4 - custom)]
Control 0xdf: +/512/0 [VCP Version]
Control 0xe0: +/0/2 [SAM: Color preset (0 - normal/1 - warm/2 - cool)]
Control 0xe1: +/1/1 [SAM: Power control (0 - off/1 - on)]
Control 0xe2: +/0/1 [???]
Control 0xed: +/108/255 [SAM: Red Video Black Level]
Control 0xee: +/101/255 [SAM: Green Video Black Level]
Control 0xef: +/103/255 [SAM: Blue Video Black Level]
一个有趣的问题是,您的监视器是否返回这段数据,如果没有,如果当前关闭,它是否会响应。
发布于 2013-04-21 18:58:04
来自systembash.com的代码摘自链接,以防有一天它会宕机:
#!/bin/bash
export DISPLAY=:0.0
if [ $# -eq 0 ]; then
echo usage: $(basename $0) "on|off|status"
exit 1
fi
if [ $1 = "off" ]; then
echo -en "Turning monitor off..."
xset dpms force off
echo -en "done.\nCheck:"
xset -q|grep "Monitor is"
elif [ $1 = "on" ]; then
echo -en "Turning monitor on..."
xset dpms force on
echo -en "done.\nCheck:"
xset -q|grep "Monitor is"
elif [ $1 = "status" ]; then
xset -q|sed -ne 's/^[ ]*Monitor is //p'
else
echo usage: $(basename $0) "on|off|status"
fi
发布于 2010-08-08 22:14:57
如果您的视频驱动程序支持此扩展,您可以使用xrandr命令行实用程序获取一些信息。
https://stackoverflow.com/questions/3433203
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