I just got my HP Envy x360 with a Ryzen 2500u and I am looking to get a longer battery life on Linux (Gentoo) by saving some power by underclocking it, and vice versa when the device is plugged in..
lscpu reports the following about the CPU:
CPU MHz: 1636.924
CPU max MHz: 2000.0000
CPU min MHz: 1600.0000
cpupower frequency-info seems to confirm this:
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: Cannot determine or is not supported.
hardware limits: 1.60 GHz - 2.00 GHz
available frequency steps: 2.00 GHz, 1.70 GHz, 1.60 GHz
available cpufreq governors: ondemand userspace powersave conservative performance schedutil
current policy: frequency should be within 1.60 GHz and 2.00 GHz.
The governor "conservative" may decide which speed to use
within this range.
For reference my kernel is 4.15rc7 and I am using the "git" version of linux-firmware.
Is this information correct? Every Intel CPU I have ever owned allowed me to downclock to 800MhZ. ARM is even better, allowing either 200MhZ or 100MhZ depending on the manufacturer. Furthermore, the maximum frequency seems low, especially compared to the 3.6GhZ boost clock promised for the 2500u.
And if not, how can I get a larger frequency range?