I recently added various 16:9 display modes to my second monitor (connected on the VGA connector) following a youtube tutorial. It worked fine. But after restarting the computer the display options are back to the default 4:3 resolution, and the added ones (16:9) are not there any more.
Do you have to "save" settings manually? that gets tediuos.
--UPDATE--
The OS is Ubuntu 20.04.2 LTS (64 bit)
Graphics: GeForce GT 620/PCIe/SSE2 / GeForce GT 620/PCIe/SSE2
Gnome vers 3.36.8
The procedure I found in youtube and followed in the terminal is (now doing for 16:10 res):
cvt 1680 1050
xrandr --newmode "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
xrandr --addmode VGA-1-1 1680x1050_60.00
after that I must change resolution in the settings>monitors panel. It works. But after restart I must do all again.
-- Update --
This is the latest configuration that works for my DELL monitor:
cvt 1366 768
xrandr --newmode "1368x768_60.00" 85.25 1368 1440 1576 1784 768 771 781 798 -hsync +vsync
xrandr --addmode VGA-1-1 1368x768_60.00
This works well: after adding those lines in the terminal Ubuntu "recovers" the last monitors configuration used before restart and hence the resolution and positions of both monitors to each other (one on top of the other). That means I don't need to change anything again in the settings>monitors panel. But I would like to know where this change can be made permanent, what files must I edit, and not need to add a mode every new restart.
