Comment 21 for bug 1892296

@Daniel: That current mode is from the xrandr.txt when the working 2560x1440 resolution is set. Lionel and I got the 23.98 Hz figure from monitors.xml that I generated after the 1920x1080 change is applied and the monitor has no signal. With the monitor receiving no signal in 1920x1080, the verbose xrandr shows:

  1920x1080 (0xc6) 74.176MHz +HSync +VSync *current
        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

So g-c-c is definitely choosing the lowest refresh rate, whereas if I use xrandr's --mode option to set 1920x1080, it choose the 60 Hz rate, which works.