Xrandr modify resolution and refresh rate

Query the current display information

Direct operation xrandr that will do .
My execution results are as follows , Too much information , I put out the key parts ：

[email protected]: ~/.screenlayout $ xrandr                                        [14:41:35]
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
HDMI-1 connected 1920x1080+0+774 (normal left inverted right x axis y axis) 527mm x 293mm
   1920x1080     60.00*+  74.99    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
DP-1 connected primary 3840x2160+1920+0 (normal left inverted right x axis y axis) 597mm x 336mm
   3840x2160     60.00 +  29.98* 
   1920x2160     59.99  

All supported resolutions and refresh rates will be listed .

Query the current resolution

This is simpler , Just look *+ Two symbols on which line is ok . The result above is ：
HDMI-1 The resolution of the 1920x1080 The refresh rate is 60.00

Query refresh rate

check * Where is the number , For example, my message above is

HDMI-1 60.00
DP-1 29.98

Set the refresh rate

DP-1 29.98 You'll feel a little uneasy , What if you set the refresh rate ？ Add parameters to the parameters -r 60.00 Can be adjusted to 60 The refresh rate .
The complete command is as follows ：

xrandr --output eDP-1 --off --output HDMI-1 --mode 1920x1080 --pos 0x774 --rotate normal --output DP-1 -r 60.00 --primary --mode 3840x2160 --pos 1920x0 --rotate normal --output DP-2 --off --output DP-3 --off --output DP-4 --off```

Set the resolution display position and check whether the display is on

All of these can be used xrandr To achieve , It's just not intuitive. Some values need to be calculated manually . I recommend using ARandR To graphically set , And can automatically generate xrandr command . In fact, the commands I'm using are automatically generated .