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.
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