huxmut wrote: 
> https://www.raspberrypi.org/documentation/configuration/config-txt/video.md
> 
> as a bare minimum id change that cvt to be 800 480 x x x x . the current
> listing has it in portrait mode
> better yet, can you use one of the predefined modes on that page instead
> of the config you have listed ?


Yes, i have already tested.
When i configure hdmi_mode=87 (custum mode) in order to set the cvt
setting, nothing display.
When i fix hdmi mode=4 (640x480 60Hz), same mode used with hdmi_safe=1,
i I guess pcp displayed on the screen but sacadically duplicated in 3 or
4 times.
I have the impression that it does not take my parameters in custom
mode, while it was well taken into account with the pi3...
I have tested :
hdmi_cvt 480 800 60 6 0 0 0
hdmi_cvt=480 800 60 6 0 0 0
hdmi_cvt 800 480 60 6 0 0 0
hdmi_cvt=800 480 60 6 0 0 0
here the manufacturer's document
:https://www.waveshare.com/wiki/4inch_HDMI_LCD


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