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    <p>The VESA DDC connection is an <a href="http://en.wikipedia.org/wiki/I%C2%B2C" rel="noreferrer">I2C</a> connection that can be used to query the presence of the monitor.</p> <p><a href="https://i2c.wiki.kernel.org/index.php/Main_Page" rel="noreferrer">Linux exposes the I2C device</a> and userland programs can communicate directly with the monitor with code such as that at <a href="http://jaffar.cs.msu.su/oleg/ddcci/" rel="noreferrer">http://jaffar.cs.msu.su/oleg/ddcci/</a> </p> <p>Notice this below: <code>Control 0xe1: +/1/1 [SAM: Power control (0 - off/1 - on)]</code> </p> <pre><code># 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] </code></pre> <p>An interesting question is whether or not your monitor returns that piece of data, and if not, whether it responds at all if it's currently turned off.</p>
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    1. POHow to Determine if LCD Monitor is Turned on From Linux Command Line
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    1. COIt does. It is even possible to turn your monitor on and off from the command line.
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    2. COddcci is now ddccontrol: http://sourceforge.net/projects/ddccontrol/ As Eren said, it does, and you can even do it yourself with `ddccontrol -r 0xe1 -w 0`
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