linux: change external display brightness via software (connected via displayport)

revision bce6a802f4f9b9a3815f420d9c4b8823494fd80e

raw

commands.sh

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# 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
 

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