rich1.0phorkiehttps://p.cweiske.de/linux: change external display brightness via software (connected via displayport)Christian Weiske86400900900<!-- embedding all files of https://p.cweiske.de/807 -->
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<p>VESA has the "Display Data Channel" standard to query information from monitor.</p>
<p>MCCS (Monitor Control Command Set) is the control command specification.</p>
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</pre></td><td class="de1"><pre class="de1"><span class="co0"># ddcutil detect</span>
Display <span class="nu0">1</span>
   I2C bus:             <span class="sy0">/</span>dev<span class="sy0">/</span>i2c-<span class="nu0">1</span>
   EDID synopsis:
      Mfg id:           LEN
      Model:            LEN T22i-<span class="nu0">10</span>
      Serial number:    V5M56770
      Manufacture year: <span class="nu0">2017</span>
      EDID version:     <span class="nu0">1.4</span>
   VCP version:         <span class="nu0">2.2</span>
 
Invalid display
   I2C bus:             <span class="sy0">/</span>dev<span class="sy0">/</span>i2c-<span class="nu0">4</span>
   EDID synopsis:
      Mfg id:           SAM
      Model:            SyncMaster
      Serial number:    H9MSB25698
      Manufacture year: <span class="nu0">2009</span>
      EDID version:     <span class="nu0">1.3</span>
   DDC communication failed
 
 
<span class="co0"># ddcutil --display=1 getvcp 10</span>
VCP code 0x10 <span class="br0">(</span>Brightness                    <span class="br0">)</span>: current value =   <span class="nu0">100</span>, max value =   <span class="nu0">100</span>
 
<span class="co0"># ddcutil --display=1 setvcp 10 80</span>
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