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$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 16384 x 16384
HDMI-1 connected primary 1024x768+0+0 (normal left inverted right x
axis y axis) 160mm x 90mm
1024x768 60.00*+ 75.03 70.07 60.00
1920x1080 60.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 74.98 59.90
1280x960 60.00
1280x800 59.91
1152x864 59.97
1280x720 60.00 59.94
800x600 75.00 60.32
640x480 75.00 60.00 59.94
HDMI-2 disconnected (normal left inverted right x axis y axis)
Now the default resolution I was running on before this was 1600x900 but somehow it has come back to the default of 1024x768. Even the display it has detected is fault, it is a 21' LED monitor, Viewsonic, while it shows some other brand name from some other company/brand which I haven't heard.
How can I fix this?
The Desktop environment is mate, The display manager is lightdm, while marco is the minimal window manager.