Hello, i am a newbie.
I have a problem with my setup. I got no output with the examples. I use a RPI 2b+ and a Adafruit RGB Matrix Bonnet to drive a 64x64 LED Matrix of Aliexpress (https://a.aliexpress.com/_mLDLYhN)
For the hardware part:
- I have soldered GPIO4 & GPIO18 for the quality setting
- shorted out the middle pad to ‘8’ on the backside of the Adafruit RGB LED Bonnet
For the software part:
- I have installed the LED-matrix library with quality mod for the bonnet.
I tried a couple of different flags. But i think, this should be the right:
sudo ./demo -D0 --led-rows=64 --led-cols=64
The RPI starts the DEMO, but the panel remains black. Absolutely nothing happens.
Please help 
Best Regards!
did you have a look on the docs regarding the bonnet?
Hey Thank you for your help!
Yes i have read that. I also have read the instruction of Adafruit: Driving Matrices | Adafruit RGB Matrix Bonnet for Raspberry Pi | Adafruit Learning System
But it doesn´t help 
You definitely need to add
–led-gpio-mapping=adafruit-hat
when runnng demos and examples if you are using 64*64 panels. Otherwise you will see nothing.
Ok thank you. But i also tried this with this comand. With no success.
sudo ./demo -D0 --led-rows=64 --led-cols=64 --led-gpio-mapping=adafruit-hat
I am using a raspberry pi 4 model b with adafruit bonnet and this command works for me:
sudo ./demo -D 0 --led-rows=64 --led-cols=64 --led-gpio-mapping=adafruit-hat --led-slowdown-gpio=2
It worked without the slowdown but with flashing and flicker. My panels are from ALIExpress marked hub75e (Part no. DC2P8298A3) with 1/32 scan current. If you have the same panels then I suspect you downloaded and built the wrong rpi-rgb-led-matrix package.
Yes i think i have the same panels. They are also hub75e and 1/32. (DCHY-P2-6464-1515-VP) I linked them above.
Hm i dont think so. I used this pack:
curl https://raw.githubusercontent.com/adafruit/Raspberry-Pi-Installer-Scripts/master/rgb-matrix.sh >rgb-matrix.sh
sudo bash rgb-matrix.sh
Well that’s what I did (though I also downloaded the rpi-fb-matrix stuff too since I wanted to be able to copy anything displayed via HDMI to the panels.
I also did the following:
sudo apt-get install -y build-essential libconfig+±dev
make
then ran the display-test app and built the rgb utils
then I installed graphixMagic
sudo apt-get install libgraphicsmagick+±dev
Hmm ok. I dont think that could help me. Because i want to dosomething different with it, but first, i need to get run the demo 
I have got a PDF from the manufacture: FM6124(英文版）.pdf | DocDroid
Maybe this could help ?? xD
I know now, that the ICs on the panel maybe not work without a a implementation of the initialization of FM6124 in the matrix framebuffer.cc and wire it up. But i couldn´t do this with my knowledge.
Which panels have been tested and recommended? I need 3 pieces of P2 64x64 panels.
I use FM6126 and FM6127 128x64 P2 panels from azerone, they work fine for me.