What is wrong?

$ xrandr --output HDMI-1 --gamma 0.6:1.0:1.6 --brightness 0.76
$ xrandr --verbose | sed -n '/HDMI-1/,/Brightness/p'
HDMI-1 connected 1920x1080+0+0 (0x6c) normal (normal left inverted right x axis y axis) 510mm x 290mm
    Identifier: 0x63
    Timestamp:  65733000
    Subpixel:   unknown
    Gamma:      1.7:1.0:0.63
    Brightness: 0.75
  • I can confirm the bug has same results for me using Ubuntu 16.04.5 LTS and kernel 4.4.0-135-generic. – WinEunuuchs2Unix Sep 29 '18 at 0:44

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