EDIT: Now all resolutions are available. I am not aware of what did I do to change this...
Using Ubuntu 20.04 in my Lenovo Thinkpad P52.
I added custom screen resolution modes with xrandr, and made them permanent via ~/.xprofile:
xrandr --newmode "1344x768_60.00" 84.00 1344 1416 1552 1760 768 771 781 798 -hsync +vsync
xrandr --newmode "1344x744_60.00" 80.75 1344 1408 1544 1744 744 747 757 773 -hsync +vsync
xrandr --addmode eDP-1-1 "1344x768_60.00"
xrandr --addmode eDP-1-1 "1344x744_60.00"
Now they show as available in xrandr -q (see below),
but they do not show in Settings -> Displays -> Resolution
Moreover, there are many other available modes, which were not added by me, which do not show in Settings either. I could select my custom modes via command line with, e.g.,
$ xrandr --output eDP-1-1 --mode "1344x744_60.00"
but I want to have them available also via menu.
How can I have at least my custom modes shown in Settings?
What determines which modes are shown in Settings?
Output of xrandr -q
$ xrandr -q
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
1920x1080 60.01 + 60.01 59.97 59.96 59.93*
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 60.00
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 60.06
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
1344x768_60.00 59.81
1344x744_60.00 59.90
1344x768_60.00 (0x2ba) 84.000MHz -HSync +VSync
h: width 1344 start 1416 end 1552 total 1760 skew 0 clock 47.73KHz
v: height 768 start 771 end 781 total 798 clock 59.81Hz
1344x744_60.00 (0x2bb) 80.750MHz -HSync +VSync
h: width 1344 start 1408 end 1544 total 1744 skew 0 clock 46.30KHz
v: height 744 start 747 end 757 total 773 clock 59.90Hz
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