Overclocking and Flickering

hzeller / rpi-rgb-led-matrix

Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO

GNU General Public License v2.0

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Open Saij opened 9 years ago

Saij commented 9 years ago

Hi,

played a little bit with overclocking and determined that overclocking result in flickering.

Here is my config.txt (only overclocking part)

arm_freq=1000
sdram_freq=500
core_freq=500
over_voltage=2
force_turbo=1
disable_splash=1
boot_delay=0
gpu_mem=16

RPi is stable and no problems with cyclictest. But as soon as I run led-matrix it will flicker. Even with -p 4

A test shows that after removing the overclock settings matrix just works fine again. Just as information

Greetings Saij

hzeller commented 9 years ago

Interesting. In the master or the pwm branch ?

Saij commented 9 years ago

Used the PWM branch

Saij commented 9 years ago

Used also 3.18.9 RT5 kernel

hzeller commented 9 years ago

Interesting. Maybe the transition between the two clock-domains is affected (the ARM clock domain and the PWM unit are separated by a queue).

hzeller commented 9 years ago

Speaking of the RT kernel: did you see any difference ?

Saij commented 9 years ago

Not really But it seems to Run smoother. Without it you could sometimes see some flicker. With it no flicker at all

combs commented 1 year ago

I have a feeling this may have changed in the intervening years?