Thanks,
Looking at your xrandr.txt there is the modeline :
1920x1080 (0xc6) 74.176MHz +HSync +VSync
h: width 1920 start 2558 end 2602 total 2750 skew 0 clock 26.97KHz
v: height 1080 start 1084 end 1089 total 1125 clock 23.98Hz
That means the refresh rate accepted by your display should be :
74.176MHz / (2750 x 1125) = 23.9760808081 Hz
Due to floating point error, in monitors.xml you get 23.976079940795898 Hz
Maybe the issue comes from this ?
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https://bugs.launchpad.net/bugs/1892296
Title:
gnome-control-center cannot change resolution of external monitor
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