Tadont

--led-slowdown-gpio=5 produced such a result. led multiplexing doesn't change anything. Maybe some more advice? 

@anandrajgupta, Unfortunately, none of the above settings help.

the chip that my rgb matrix uses: SM16169S

@wata-net DP7268 number of the second chip on the panel

But for some reason it doesn't work

Got to achieve this. How to remove the rest?