I have tested the cpufreq-set -f 400MHz command for several kernels in Debian 9, and here is the result:
Kernels 4.9.0-3 to 4.9.0-5: CPU scaling is OK (but hibernation fails) Kernels 4.13.0-0 CPU scaling fails to achieve constant lowest frequency available (but hibernation seems to work). So it seems the bug in the CPU frequency scaling was introducing after 4.9.0-5 and before 4.13.0-0 I don't know how to test any kernel between those two because they are not in Backports. I am willing to test them if you could provide any link where I can find instructions on how to get those kernels. Thanks. -- ---------------------------------------------------------------------------- ---- Eduardo Guerras Valera Homer L. Dodge Department of Physics and Astronomy 440 W. Brooks St. - Norman, OK 73019-0225 - USA ---------------------------------------------------------------------------- ----
