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Showing content from https://github.com/hzeller/rpi-rgb-led-matrix/issues/483 below:

Another flicker issue · Issue #483 · hzeller/rpi-rgb-led-matrix · GitHub

First, thanks for a great library and all the thought that's gone into the details!

I'm working with a 64x64 matrix and see drops in intensity randomly every 5-15s. I've gone through your notes and tried everything to eliminate these:

• added 3300 uf low-ESD caps at the leads
• have a solid 40A power supply with heavy gauge hookup
• using an Adafruit hat with the PWM modification
• stopped audio, GUI on the Pi
• no other processes running
• tried the iso1cpus=3 setting
• running with
  pixel-push -i wlan0 -U --led-chain=4 --led-parallel=1 -R 90 -u 65507 --led-show-refresh --led-scan-mode=0 --led-gpio-mapping=adafruit-hat-pwm --led-slowdown-gpio=2 -d
• uname -a:
  Linux raspberrypi 4.9.35-v7+ Added V-Mapper:Z for flipped orientation panels chains #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l GNU/Linux
• running on Pi 3 Model B

I hooked up a photoresistor to a scope to capture what I'm seeing visually -- see attached image. Looks like ~160Hz refresh rate with occasional drops in level.

Any other ideas?

Thanks,
Brent

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