setup colors or speed in 3,5inch screen

[ikarian_nik]

Hello!! i'm a new user of retropie. I got one raspberry pi3 model B with 32GB micro sd. I got one 5v 2.5A power supply adapter. I have retropie 4.3 made from a Pre made SD Image on RetroPie website. I also have one snes usb controler and one 3.5 Inch 320 X 480 TFT LCD Display Touch Board For Raspberry Pi 2 Raspberry Pi 3 Model B. I have made the setup of retropie and download some roms. In my tv all work perfect!! I follow this instructions and i setup my screen:
https://retropie.org.uk/forum/topic/4157/guide-retropie-3-5-inch-rpi-lcd-v3-0-no-brand

My problem is that the speed on my screen is low. I have my /boot/confing.txt file make it like this:

dtoverlay=waveshare35a,fps=50,debug=32,bgr=1

When i go and put the speed parameter for ex.:

dtoverlay=waveshare35a,fps=50,debug=32,bgr=1,speed 50000000

The speed is just fine but it mess up the colors of my screen everywhere( on menu,on games...)
When i delete the speed the colors come back but with slow speed.
Can enyone have the same problem and who did you solve it?
Thanks!!!!

[juj]

You probably were able to figure this one out since it has been quite some time, though just wanted to reply for anyone stumbling to this; the mixed up colors seem to be an artifact of the SPI bus bandwidth limitations of the ILI9486 controller chip on the display. If the display is driven too fast that the controller simply cannot handle it, the colors on the whole display can get distorted. There is no way around it.

My ILI9486 has maximum speed of 31.88MHz (31880000), and beyond that the colors get messed up. I posted a comment on the thread you linked to with more information about the observed limits of ILI9486 with a video. With fbcp-ili9341 project I was able to squeeze out some more performance from the ILI9486 compared to the dtoverlay method, but beyond simple retro games, it looks like ILI9486 is definitely not a display controller for fast paced games.