CPU Frequency on battery power very low on a Intel 12gen

[tipoman9]

Replaced the Intel Pstate driver, as can be seen below.
I always get :
CPU max frequency: 2501 MHz
CPU min frequency: 400 MHz
regardless of settings in /etc/auto-cpufreq.conf
While on AC power, the system works as expected.
On battery power the CPU never gets above 2500Mhz, even though the temp is below 40 degrees.
On AC they reach 4400Mhz.

Using settings defined in /etc/auto-cpufreq.conf file

Note: You can quit stats mode by pressing "ctrl+c"
Configuration file enforces turbo boost
setting turbo boost: on

-------------------------------------------------------------------------------

		"auto-cpufreq" is about to refresh ...
		Executed on: March 03 (Sunday) - 01:03:21

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Linux distro: Ubuntu 22.04 Jammy Jellyfish
Linux kernel: 6.2.0-39-generic
Processor: 12th Gen Intel(R) Core(TM) i3-1215U
Cores: 8
Architecture: x86_64
Driver: acpi-cpufreq

------------------------------ Current CPU stats ------------------------------

CPU max frequency: 2501 MHz
CPU min frequency: 400 MHz

Core	Usage	Temperature	Frequency
CPU0      4.0%        36 °C      1063 MHz
CPU1      3.0%        36 °C       752 MHz
CPU2      5.1%        37 °C      1905 MHz
CPU3      5.9%        37 °C       401 MHz
CPU4      5.1%        38 °C      1671 MHz
CPU5      4.0%        38 °C      2501 MHz
CPU6      2.0%        38 °C      2081 MHz
CPU7      9.3%        38 °C      1590 MHz

CPU fan speed: 3011 RPM

---------------------------- CPU frequency scaling ----------------------------

Setting to use: "performance" governor
Warning: governor overwritten using `--force` flag.
Not setting EPP (not supported by system)

Total CPU usage: 4.1 %
Total system load: 1.09
Average temp. of all cores: 37.25 °C 

Configuration file enforces turbo boost
setting turbo boost: on

[tipoman9]

After a day of attempts, switched the driver with intel_pstate=disable , disabled C0 CPU halts with idle=poll in grub, tweaked /dev/cpu_dma_latency and etc brought no improvement.
Intalled portable windows 10 and compared. The performance loss in battery mode seems similar, though on Windows the CPU drops to about 3200Mhz, while on Linux I get 2800Mhz max.
Performance reported by "7z b" is about 20% better in windows 10 than Ubuntu 22.04.
So there seems to be some minor possibility for improvement....

[tipoman9]

Seems the laptop is restricted by the manufacturer to no more than 15Watt while on battery. Played with throttlestop under windows and throttled undel linux.
Under windows I can keep constant 16Watt and 26000 performance rating of 7z b
Under linux the I barely reach 10W and 15000 performance rating. Use this to monitor sudo turbostat --Summary --quiet --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,GFXWatt,CorWatt --interval 6
Seems there is some issue under Linux, same hardware is twice slower.