powertop
Parece que você tem que dar alguns dias para coletar os dados necessários para realizar esses cálculos, pelo menos de acordo com este Q & AU intitulado: coluna de potência perdida no powertop? .
trecho
If you newly installed PowerTop, give it some time... It takes a few days to get the estimates correct and then starts displaying. I found this info on the net and also speak from experience...
powerstat
Se você quiser apenas o consumo de energia, use o pacote powerstat
. Há uma demonstração mais completa aqui, intitulada: powerstat: Calculadora de Consumo de Energia para o Ubuntu Linux .
$ sudo powerstat -d 0
Mostrará o consumo de energia em watts
Running for 480 seconds (48 samples at 10 second intervals).
ACPI battery power measurements will start in 0 seconds time
Time User Nice Sys Idle IO Run Ctxt/s IRQ/s Fork Exec Exit Watts
11:19:41 4.2 0.0 1.4 94.4 0.0 1 8731 518 20 20 20 9.44
11:19:51 1.6 0.0 0.9 97.4 0.0 1 2165 301 20 20 20 10.78
11:20:01 1.7 0.0 1.0 97.3 0.0 1 7788 400 20 20 20 12.27
Average 2.5 0.0 1.1 96.3 0.0 1.0 6228.0 406.3 20.0 20.0 20.0 10.83
StdDev 1.2 0.0 0.2 1.4 0.0 0.0 2898.3 89.0 0.0 0.0 0.0 1.16
Minimum 1.6 0.0 0.9 94.4 0.0 1.0 2165.4 300.6 20.0 20.0 20.0 9.44
Maximum 4.2 0.0 1.4 97.4 0.0 1.0 8730.7 518.3 20.0 20.0 20.0 12.27
Summary:
10.83 Watts on Average with Standard Deviation 1.16