I tested again without the acpi kernel parameter and it does seems to have little or no effect. The result may come from different screen brightness.
By the way, at the time I bought the 11th gen framework laptop, on arch wiki there was a tip about acpi_osi kernel parameter. That tip said leaving it to blank may lead to CPU stalls and the possible preferred option was “Windows 2020”.
But now that tip is gone. Are there some issues that’s not present on 12th gen motherboards?