@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.
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https://bugs.launchpad.net/bugs/1892296
Title:
gnome-control-center cannot change resolution of external monitor
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