[Bug 1885730] Re: Bring back ondemand.service or switch kernel default governor for pstate - pstate now defaults to performance governor

[Julian Andres Klode]

The performance governor is the right choice for servers, but it's not
the right choice on non-server platforms, it's also not the default
kernel setting, it was set because we have the ondemand.service in
userspace that can change it back to ondemand (or well we have the
service because of that change in the kernel :D).

Fans do not necessarily spin, and you might not actually notice any
significant changes in power usage, but the expectation of a desktop
user is that the CPU scales its frequencies down, which recent-ish Intel
CPUs (Skylake+) on like a ThinkPad T480s - which manage the pstates in
hardware instead of software like the old MacBook does - don't do.

If we compare this to Red Hat, what they do is
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y in RHEL and
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y in fedora.

Power usage, at 3-6% CPU usage:

Powersave: I see 0.9-1.4W power usage on the cores
Performance, I see 1.6-2.5W

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Title:
  Bring back ondemand.service or switch kernel default governor for
  pstate - pstate now defaults to performance governor

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