$ sudo apt-get install powertop Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed:   libpci3 Suggested packages:   cpufrequtils laptop-mode-tools The following NEW packages will be installed:   libpci3 powertop 0 upgraded, 2 newly installed, 0 to remove and 10 not upgraded. Need to get 202 kB of archives. After this operation, 538 kB of additional disk space will be used. Do you want to continue? [Y/n] Get:1 http://mirrordirector.raspbian.org/raspbian/ jessie/main libpci3 armhf 1:3.2.1-3 [48.2 kB] Get:2 http://mirrordirector.raspbian.org/raspbian/ jessie/main powertop armhf 2.6.1-1 [154 kB] Fetched 202 kB in 1s (113 kB/s) Selecting previously unselected package libpci3:armhf. (Reading database ... 155355 files and directories currently installed.) Preparing to unpack .../libpci3_1%3a3.2.1-3_armhf.deb ... Unpacking libpci3:armhf (1:3.2.1-3) ... Selecting previously unselected package powertop. Preparing to unpack .../powertop_2.6.1-1_armhf.deb ... Unpacking powertop (2.6.1-1) ... Processing triggers for man-db (2.7.5-1~bpo8+1) ... Setting up libpci3:armhf (1:3.2.1-3) ... Setting up powertop (2.6.1-1) ... Processing triggers for libc-bin (2.19-18+deb8u10) ... $ powertop PowerTOP v2.6.1 must be run with root privileges. exiting... $ sudo powertop Cannot load from file /var/cache/powertop/saved_results.powertop Cannot load from file /var/cache/powertop/saved_parameters.powertop RAPL device for cpu 0 Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). RAPL device for cpu 0 Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Model-specific registers (MSR)                   not found (try enabling CONFIG_X86_MSR). Cannot load from file /var/cache/powertop/saved_parameters.powertop Leaving PowerTOP  |