i try to set up a new resolution using xrandr. but nothing is happen. (Upuntu 23.10)
First i Run ‘xrandr’ command:
elhennawy@elhennawy-01:~$ xrandr
Screen 0: minimum 16 x 16, current 1024 x 768, maximum 32767 x 32767
DVI-I-2 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 59.92*+
800x600 59.86
640x480 59.38
320x240 59.52
960x600 59.63
928x580 59.88
800x500 59.50
768x480 59.90
720x480 59.71
640x400 59.95
320x200 58.96
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77
and then i run those commands:
$ cvt 1400 1050
$ xrandr --newmode "1400x1050_60.00" 121.75 1400 1488 1632 1864 1050 1053 1057 1089 -hsync +vsync
$ xrandr --addmode DVI-I-2 1400x1050_60.00
and nothing is change!.How can i to fix this?
The first list created by xrandr shows you the modes available for this given monitor. The line
1024x768 59.92*+
tells you, that it is currently running at the resolution 1024×768 at a frequency of 59.92Hz. This is indicated by the + sign at the end. The first line Screen 0: minimum 16 x 16, current 1024 x 768, maximum 32767 x 32767 only relates to the capabilities of the Xserver, meaning that it can handle this maximum virtual resolution in software, but not necessarily in hardware (here: your monitor).
Your attempts to set your monitor to 1400x1050px at 60Hz fail, because your monitor/output device does not support this. You can derive this from the first list, because this combination of resolution and frequency is not listed.
The information about the capabilities of your monitor are gained via EDMI/DDC, a communication standard to handle the data exchange between your computer and your monitor.