Thomas Renninger wrote:
> Try to boot with init=/bin/bash boot param
> mount /proc
> mount /sys
> modprobe processor
> watch -n1 cat /proc/acpi/processor/*/power
>
> The processor should mostly stay in C3 and bus master activity should be
> low. Battery lifetime should be really high (as high as under windows?).
Thanks for the tip.
I think I have found the main responsible for the processor not entering C3:
the 'radeon' kernel module. When I disable 3D Acceleration in SaX, the
processor then enters C3 state much more often.
While running watch -n1 cat /proc/acpi/processor/*/power I noticed that the
processor jumps between C2 and C3 quite often, even when the system is not
under any apparent load. Here goes the output of
cat /proc/acpi/processor/CPU0/power
25 minutes after the system has booted:
active state: C2
max_cstate: C8
bus master activity: 00000004
states:
C1: type[C1] promotion[C2] demotion[--] latency[001] usage[00000010]
*C2: type[C2] promotion[C3] demotion[C1] latency[001] usage[00159142]
C3: type[C3] promotion[--] demotion[C2] latency[085] usage[00301416]
Is it normal that C2 has so much usage even when the system is idle?
Mark
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