On Friday, 11 November 2022 10:25:58 CET basti wrote: > I have installed the 20220121_raspi_1_bullseye.img.xz image from > https://raspi.debian.net/tested-images/ > on one of my old Raspberry Pi 1B. > > As I can see cpu scaling seems to not work. Support for CPU frequency scaling on the RPi 0/1 got added [1] to the 5.14.12-2~exp1 (and later) kernel and is not available on a Bullseye system. You can get it by installing a kernel via backports or upgrading to Bookworm/ Testing. > /sys/devices/system/cpu/cpu/X//cpufreq/scaling_max_freq is not available > so I compile vcgencmd to test it. > > |root@counter:~# vcgencmd measure_clock arm > frequency(48)=700000000 > > Is always 700 Mhz, also AFAIK, the RPi 1 only has 1 frequency: 700Mhz ... > when I try to stress the Pi with "stress --cpu 2 --timeout 60s". and only 1 CPU core, so I don't expect any change in that. The RPi 0 (Zero) uses the same kernel and does have multiple frequencies. HTH [1] https://salsa.debian.org/kernel-team/linux/-/merge_requests/381
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