UPDATE: as of (Ubuntu MATE) kernel 5.15.0-130-generic, constraint 2 has re-appeared. I prefer not to close this question because I'd still like to know what happened, ie. kernel change, bug, upcoming obsolescence, etc.
Up until kernel 5.15.0-119-generic, I was able to set the "peak_power" constraint for the CPU package. Here's a snippet of the output from powercap-info intel-rapl -z 0:
name: package-0
enabled: 1
max_energy_range_uj: 262143328850
energy_uj: 7573908711
...
Constraint 2
name: peak_power
power_limit_uw: 121000000
time_window_us: 0
max_power_uw: 0
As of kernel 5.15.0-122-generic, Constraint 2 no longer exists in the reported info.
I've checked the kernel release notes, and although they mention RAPL several times, I don't see anything obviously relevant.
My CPU: lscpu(1) shows:
Model name: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
Request
I've been setting peak_power in order to greatly extend my battery life, ensure the fan doesn't run, etc.
Does anyone know how I can restore the ability to set peak_power? Or can anyone explain why it's stupid to use this method? :-)
