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I have two identical screens (2 cheap b07k32m4lj)

https://www.amazon.it/Longruner-Monitor-Display-800x480-Raspberry/dp/B07K32M4LJ

i'm trying to set them up to be both 1280x720 and show the same image (duplicate screen)

i've tried the following methods:

1: edit /boot/config.txt

as follows:

framebuffer_width=1280
framebuffer_height=720

# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_cvt=1280 720 60
hdmi_group=2
hdmi_mode=87

Now screens resolution are different (the first is 1280x720, the second is 800x480)

2: edid file via tvservice

after running the following command:

tvservice -d edid.dat

I got the file edid.dat and then added these lines to /boot/config.txt

hdmi_edid_file:1=1
hdmi_edid_filename:1=edid.dat
hdmi_force_hotplug:1=1

now I have this situation in the screen configuration utility:

enter image description here

the resoultion of the second monitor is now 1024x768 (still not what I need) while the first is still 1280x720.

Any advice on how to solve this problem?

Improve this question
3
  • the website says that the LCDs are 800x480 ... are you absolutely certain that you have two identical monitors?
    – jsotola
    Commented Sep 2, 2019 at 10:53
  • @jsotola yes it's correct, the monitors are natively 800*480, but I managed to make the first to work at 1280*720... Now i'm trying to do the same with the second (I know this is some kind of forcing but i'm doing this 'cause i've developed an app in Python which has a fixed resolution of 1280*720)
    – user2959923
    Commented Sep 2, 2019 at 11:14
  • have you tried switching the monitors around? ... there may be a difference in hardware
    – jsotola
    Commented Sep 2, 2019 at 17:47

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