OdroidC4: How to reduce clock freq below 1GHz to save power

[andi61]

Hello,

 

I tried to reduce the clock frequency with nano /etc/default/cpufrequtils.
I also set the governor to userspace in order to enable direct frequency setting.
But there is no effect to be seen with  cpufreq-info -o except the governor is switched to "userspace" now.

 

I also tried it with echo 500000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed , but clock frequency did not change.

According to the S905X3 datasheet the SoC could even run at 100Mhz...

 

I would appreciate a hint, how to reduce clock speed way below 1GHz, in order to save power consumption

 

Thanks a lot

Andy

 

PS: I am running VERSION=23.02.0-trunk

 

[SteeMan]

Speeds lower than 1Ghz were removed in this patch to mainline kernel for stability reasons:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/boot/dts/amlogic?h=v6.2&id=fd86d85401c2049f652293877c0f7e6e5afc3bbc