Secondary display doesn't work

Hi! I installed the XFCE4 edition of Endeavour OS today. Almost everything works, but the secondary display. I’ve plugged in a Dell external monitor into the DP slot, but the monitor doesn’t receive any signal from my laptop.
I tried going to Display settings, but no luck. I enable the external display, but no signal is transmitted to the Dell monitor.
Here’s my xrandr and inxi output:

$ xrandr 
Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 16384 x 16384
eDP connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080     60.02*+  39.98  
   1680x1050     60.02  
   1280x1024     60.02  
   1440x900      60.02  
   1280x800      60.02  
   1280x720      60.02  
   1024x768      60.02  
   800x600       60.02  
   640x480       60.02  
DP-1-2.8 connected (normal left inverted right x axis y axis)
   1920x1200     59.95 +  59.88  
   1920x1080     60.00    59.94    50.00    29.97    25.00    23.98  
   1600x1200     60.00  
   1280x1024     75.02    60.02  
   1280x720      60.00    59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-1-0 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-0 disconnected (normal left inverted right x axis y axis)
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 disconnected (normal left inverted right x axis y axis)

inxi output:

$ inxi -G
Graphics:  Device-1: NVIDIA TU117M [GeForce GTX 1650 Ti Mobile] driver: nvidia v: 465.31 
           Device-2: Advanced Micro Devices [AMD/ATI] Renoir driver: amdgpu v: kernel 
           Device-3: Quanta HP Wide Vision HD Camera type: USB driver: uvcvideo 
           Display: x11 server: X.org 1.20.11 driver: loaded: amdgpu,ati,nvidia unloaded: fbdev,modesetting,vesa 
           resolution: <missing: xdpyinfo> 
           Message: Unable to show advanced data. Required tool glxinfo missing. 

Same issue as No external monitors detected