I installed Zorin OS 16.2 on a different machine and tried using the same 144hz external monitor with it but in settings the highest option is 60hz. It lets me choose up to 120hz on the laptop screen itself but won't with the external monitor.
Check for a proprietary display driver
I'm using nvidia-driver-525
can you run the following command in terminal
xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 16384 x 16384
eDP-1-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 344mm x 193mm
1920x1080 60.00 + 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
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x720 60.00 50.00 59.94
1024x768 119.99 75.03 70.07 60.00
832x624 74.55
800x600 119.97 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
HDMI-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-2 disconnected (normal left inverted right x axis y axis)
HDMI-1-3 disconnected (normal left inverted right x axis y axis)
Can try
xrandr --output eDP-1-1 --rate 144
then check xrandr again to see if 144 is listed
if that doesn't work (less preferable)
cvt 1920 1080 144
Still doesn't work
Does that port support above 60hz ? Because the CVT command manually adds the mode. The other thing you could do is manually at at the Xorg config and try that way But if the external port is controlled by the IGPU and it does not support above 60 Hertz it's not going to matter.
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