Powertop on RHEL5

Hi all,

I'm trying to monitor power usage on my RHEL5.11 server. I have successfully installed powertop on my machine. But when I try to monitor the power usage it displays message :

No detailed statistics available; please enable the CONFIG_TIMER_STATS kernel option

But I cannot find kernel parameter named CONFIG_TIMER_STATS. I used sysctl -a to show configured kernel params
Has anyone ever used powertop on the RHEL machine?