I have two identical screens (2 cheap 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:


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

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


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?

  • the website says that the LCDs are 800x480 ... are you absolutely certain that you have two identical monitors? – jsotola Sep 2 '19 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 Sep 2 '19 at 11:14
  • have you tried switching the monitors around? ... there may be a difference in hardware – jsotola Sep 2 '19 at 17:47

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