hi i've bought a new notebook (hp pavilion dm1-1150sl) and installed archlinux. i have see a strange thing with powertop, i'm running the vanilla arch kernel26, and i have see this behaviour: Cn Avg residency P-states (frequencies) C0 (cpu occupata) (31,6%) C0 0,0ms ( 0,0%) C1 mwait 0,1ms ( 0,7%) C4 mwait 0,0ms (67,8%) Wakeups-from-idle per second : 31483,5 interval: 10,0s --- as you can see, i have a LOT of wakeups per seconds very low c1 states lot of c0 and c4 states, a wattmeter tell me that archlinux consume about 25/26watt Then i have boot a live ubuntu distro and see this: Cn permanenza media P-state (frequenze) C0 (cpu occupata) ( 0,6%) polling 0,0 ms ( 0,0%) C1 mwait 26,7 ms (68,6%) C4 mwait 1,2 ms (30,8%) Wakeup-da-idle al secondo: 281,3 intervallo: 15,0s --- as you can see the wakeups are a LOT lower than on arch and we have lot of c1 and c4 state, power consumption is about 20W, the same that i have with win7 (about 18/20w). For meaning about cX state see here: http://www.lesswatts.org/projects/powertop/powertop.php thanks!