[Randy11]

Hello Mdp,

I'm not sure to understand how to do that or your explication.

The main monitor is connected with the VGA port. The Max2 is connected to the HDMI-1 port.

For the moment, I've made this tests :

xrandr
Screen 0: minimum 320 x 200, current 2104 x 1560, maximum 8192 x 8192
HDMI-1 connected 2104x1560+0+0 (normal left inverted right x axis y axis) 2104mm x 1560mm
2104x1560 32.98*+
720x480i 120.00 119.88
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 433mm x 271mm
1680x1050 59.95*+
1600x1200 60.00
1280x1024 75.02 60.02
1440x900 59.89
1280x960 60.00
1152x864 75.00
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 59.94
720x400 70.08
HDMI-3 disconnected (normal left inverted right x axis y axis)

With the following commands, the Max2 is frozen :

$ xrandr --output HDMI-1 --mode 720x480i --rate 119.88
$ xrandr --output HDMI-1 --mode 720x480i --rate 120.00

But with the following, the Max2 is not frozen :

xrandr --output HDMI-1 --mode 2104x1560 --rate 32.98

For my main monitor, the following command is good :

$ xrandr --output DP-1 --mode 1280x1024 --rate 75.02

I've looked here too https://wiki.archlinux.org/index.php/Xrandr

I continue to search how modify the DPI value.