On 9/6/2010 1:35 AM, Thomas Renninger wrote:
Hi, I am adding lesswatts.org and linux-pm list. I expect you found out why you do not get frequency/P- states and it seem to be correct. On these lists, people can help you further to find out Linux vs Windows battery drain differences. If you have the same backlight settings, I expect C-state or graphics card must be the reason. There is nothing else than CPU or GPU that drains so much energy for being the reason of 20% more battery life time. Which graphics card and driver do you use (for nvidia/ati, trying the binary one for comparison, might show a big difference on a recent card)? Which C-state driver do you use (there is an acpi and intel_idle one with latest kernels): cat /sys/devices/system/cpu/cpuidle/current_driver I hope to be able to provide a c-state tool soon, for now you have to go through: cat /sys/devices/system/cpu/cpu*/cpuidle/state* to check which and how often/efficient C-states are used.
powertop will tell you exactly this (and the next version will provide much much more detail) -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
