Posts by Zohan

Hi guys

I'm in the same boat running Armor lite heatsink w pwm fan! I stumbled on info about overlays, there is 1 called gpio-fan. This is the info from the read me file

Name: gpio-fan

Info: Configure a GPIO pin to control a cooling fan.

Load: dtoverlay=gpio-fan,<param>=<val>

Params: gpiopin GPIO used to control the fan (default 12)

temp Temperature at which the fan switches on, in millicelcius (default 55000)

so i put

dtoverlay=gpio-fan,<13>=<60000> 

into config.txt (pwm wire plugged into gpio#13 and 60 for temp)

after booting i ran

vcdbg log msg

in putty to find out if it loaded. unfortunately this is what it spit out

006716.968: brfs: File read: /mfs/sd/overlays/gpio-fan.dtbo

006743.302: dterror: can't find symbol '_hot'

006743.320: Failed to resolve overlay 'gpio-fan'

Am I supposed to alter the actual overlay file?

I'm sure I'm on the right track but have no idea what I'm doing! It looks like I'm on the right track but doing something wrong.

Any help would be greatly appreciated and hopefully this will be a simple solution for others!

Hi everyone.

I'm hopping this issue is resolved as well! I've been running Hyperion backlighting on a RPi3 for a while, with issues i never sorted out. I've upgraded to RPi4 and got a hdmi capture dongle to solve some headache. if the dual (clone) output worked i wouldn't need a hdmi splitter (which is causing cec problems) to feed the capture dongle!

hmmm guess I'm shovelling someone elses project problems into your hands

Either way, thanks for the great work over the years!