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On my Raspberry Pi 5, I noticed that /sys/devices/system/cpu/cpuidle/current_driver contained none. So I got the latest kernel sources from here and enabled CONFIG_ARM_PSCI_CPUIDLE in menuconfig. Compared to the bcm2712_defconfig, these are the only changes:

CONFIG_CPU_IDLE_MULTIPLE_DRIVERS=y
CONFIG_DT_IDLE_STATES=y
CONFIG_DT_IDLE_GENPD=y
CONFIG_ARM_PSCI_CPUIDLE=y
CONFIG_ARM_PSCI_CPUIDLE_DOMAIN=y

I compiled and installed the kernel according to this guide (specifically the cross-compiling part). It successfully booted and I verified that I am running the new kernel.

Unfortunately, /sys/devices/system/cpu/cpuidle/current_driver still contains none. As I am out of ideas right now what could be at fault, I hope anybody here can help!

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