How to change CPU scaling governor

I’m using Bazzite (Desktop version) on my PC with AMD Ryzen CPU. I see that default scaling governor is set to powersave:

$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
powersave

There is additionally performance governor available, but nothing more:

$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors
performance powersave

I tried to change /etc/tuned/ppd.conf file like here (commented-out lines are these that I have actually changed):

[main]
# The default PPD profile
#default=balanced
#battery_detection=true
default=performance
battery_detection=false

[profiles]
# PPD = TuneD
power-saver=powersave
balanced=balanced-bazzite
performance=throughput-performance-bazzite

[battery]
# PPD = TuneD
balanced=balanced-battery-bazzite

and restarting, but that didn’t do anything, at least to /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor - it’s still on powersave.
My PC is hooked up to a UPS, so just to be sure, I disabled battery detection there to prevent any performance limits that could be applied by tuned.

How to change default scaling governor? For example, Is it possible to have the ondemand governor with current Bazzite image?

Just rpm-ostree kargs --append "cpufreq.default_governor=ondemand" no?