On 9/6/2010 3:03 PM, Tiago Marques wrote: > On Mon, Sep 6, 2010 at 4:47 PM, Arjan van de Ven<arjan@xxxxxxxxxxxxxxx> wrote: >> 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 >> > Thank you. Please see my previous e-mail. C0, C1 and C4. Do you know > of any way to force the intermediate ones for debugging? intel_idle driver is the only way that's reasonable in amount of work. for anything else you depend on the grace of the bios. _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
