Mark Hellman wrote:
> Anton Farygin wrote:
>
>>Also, if driver is radeon, then may be help this option in xorg.conf:
>> Option "DynamicClocks" "boolean"
>> Enable dynamic clock scaling. The on-chip clocks will
>> scale
>> dynamically based on usage. This can help reduce heat
>> and
>> increase battery life by reducing power usage. Some
>> users
>> report reduced 3D preformance with this enabled. The
>> default is off.
>
> A tried your suggestion, but there was hardly any battery life improvement
> in the type of experiment I have done.
>
> I made the same experiment on another laptop (Intel Celeron based), and the
> battery life of Windows XP and SuSE 9.3 was exacly the same. So the
> discrepancy I measured on the Pentium M laptop remains a mistery to me...
>
>
That's very interessting.
Could you please compare the supported C-states on the machines. I bet it is
related to those.
Please also have a look at "cat /proc/sys/kernel/HZ".
Theoretically it could also be throttling, but I doubt it:
cat /proc/acpi/processor/*/throttling or powersave -T
You could increase allowed throttling, if the machine is idle using the
powersave
daemon. Default is 50% throttling after 10 seconds idle time (also for
performance scheme?)
Thomas
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