FYI: Disabling IPV6 on the Quad Sata Hat will disable your Fans

[Ozz]

Learned this one the hard way; thought it might be useful for others in my situation.

Disabled IPV6 for downloading purposes, didn’t realize the GPIO pins used the IPV6 address as loopback.

Edit: I’m utilizing a Pi 4 on Linux 5.4.51 / otherwise vanilla Raspberry Pi OS (previously called Raspbian); 4 drives.

[jack]

Thanks for sharing. Can you confirm that disabling the IPV6, the top board is working fine now?

[Ozz]

Hey Jack; it’s the other way around. If you disable IPV6 the top hat stops working. You have to keep IPV6 enabled for the top hat to work.

I can confirm it works.

[michael]

Trying to to run my pihole without IPV6 resulted in same issue.
I followed this advice of pompopom

Pi 4 Quad Sata Hat Fan always at 100%

There’s a workaround in starting the PIGPGIO service in IPV4 only mode. That way you can disable IPV6 at system level. /lib/systemd/system/pigpiod.service ExecStart=/usr/bin/pigpiod -l -m -n 127.0.0.1 -p 8888 The -m option is not mandatory but for disabling the monitoring for the service, decreasing CPU usage by 7%

and fans are running fine without IPV6.

[LinAdmin]

This software must by a truly ugly mess…