Set external screen resolution (solved)

[fireport]

Hi guys,

I have an x88pro 10 with a debian bulleye installation.

I bought an external lcd touchscreen monitor to control my klipper printer with Klipperscreen.

This screen is sold for a 1024x600 resolution but the system sees it as a 1920*1080.

I can control the printer but the resolution is huge and the screens are slow.

I tried to set the resolution using

setenv video-mode sunxi:1024x768-16@60,monitor=hdmi,hpd=0,edid=0

but nothing change.

 

this is the output of xrandr

user@klipper:/boot$ DISPLAY=:0 xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 4096 x 4096
HDMI-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 476mm x 268mm
   1920x1080     60.00*   50.00
   1920x1080i    60.00    50.00
   1280x720      60.00    50.00
   1024x768      60.00
   800x600       60.32    56.25
   720x576       50.00
   720x480       59.94

Which is the correct way to set up the correct resolution?

Thanks !

 

Edited April 26, 2023 by fireport

[fireport]

Writing this post opened my mind....

I solved creating a custom X11 configuration under /etc/X11/xorg.conf.d/02-monitor.conf

Section "Monitor"
  Identifier "HDMI-1"
  VendorName "Monitor Vendor"
  ModelName "JRP7003"
  DisplaySize 1024 768
  HorizSync 30.0 - 70.0
  VertRefresh 50.0 - 180.0
  Modeline "1024x768@60.0"   65.00  1024 1048 1184 1344  768 771 777 806 
 
EndSection

Section "Screen"
    Identifier             "Screen0"  #Collapse Monitor and Device section to Screen section
    #Device                 "Device0"
    Monitor                "HDMI-1"
    DefaultDepth            16 #Choose the depth (16||24)
    SubSection             "Display"
        Depth               16
        Modes              "1024x768" #Choose the resolution
    EndSubSection
EndSection