# ddcutil detect
Display 1
   I2C bus:             /dev/i2c-1
   EDID synopsis:
      Mfg id:           LEN
      Model:            LEN T22i-10
      Serial number:    V5M56770
      Manufacture year: 2017
      EDID version:     1.4
   VCP version:         2.2

Invalid display
   I2C bus:             /dev/i2c-4
   EDID synopsis:
      Mfg id:           SAM
      Model:            SyncMaster
      Serial number:    H9MSB25698
      Manufacture year: 2009
      EDID version:     1.3
   DDC communication failed


# ddcutil --display=1 getvcp 10
VCP code 0x10 (Brightness                    ): current value =   100, max value =   100

# ddcutil --display=1 setvcp 10 80
