cpupower info [ -b ]
cpupower info shows kernel configurations or processor hardware registers affecting processor power saving policies.
Some options are platform wide, some affect single cores. By default values of core zero are displayed only. cpupower --cpu all cpuinfo will show the settings of all cores, see cpupower(1) how to choose specific cores.
Options are described in detail in:
cpupower(1), cpupower-idle-info(1), cpupower-idle-set(1), cpupower-set(1).