Hello,
I have a MacBook with a Core2Duo (T8300 Penryn) on which I am currently
running Linux (Ubuntu hardy with 2.6.24 x64). It seems like the battery
life is quite a bit worse in Linux than in Mac OS X. Whereas in OS X I
can get a displayed battery usage of up to 7 hours with minimum usage
(about 8W) And still about 6 hours with Bluetooth and Wireless enabled,
in Linux I can't get much below 11W.
So I tried using powertop to find out if I could reduce the power usage.
One thing I have noticed is, that it does not list more than C3,
although I thought the new Penryns had two lower power states C4 and C6.
I have read in other messages on the list, that the bios sometimes
doesn't report the deeper states, but uses them anyway. Is there a way
to find out if this computer really is using the deepest sleep states?
Cn Avg residency P-states (frequencies)
C0 (cpu running) ( 1.2%) 2.40 Ghz 0.0%
C1 0.0ms ( 0.0%) 2.21 Ghz 0.0%
C2 0.0ms ( 0.0%) 2.00 Ghz 0.0%
C3 16.8ms (98.8%) 800 Mhz 100.0%
Wakeups-from-idle per second : 58.6 interval: 10.0s
Power usage (ACPI estimate): 11.7W (2.0 hours)
Top causes for wakeups:
40.2% ( 31.3) <kernel module> : ntoskernel_init_device
(update_user_shared_data_proc)
24.9% ( 19.4) USB device 6-2 : Apple Internal Keyboard / Trackpad
(Apple Computer)
10.3% ( 8.0) <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)
5.8% ( 4.5) gnome-terminal : schedule_timeout (process_timeout)
3.7% ( 2.9) trackerd : schedule_timeout (process_timeout)
3.3% ( 2.6) <kernel IPI> : Rescheduling interrupts
1.7% ( 1.3) pulseaudio : schedule_timeout (process_timeout)
cat /proc/acpi/processor/CPU0/power
active state: C0
max_cstate: C8
bus master activity: 00000000
maximum allowed latency: 8000 usec
states:
C1: type[C1] promotion[--] demotion[--]
latency[001] usage[00000074] duration[00000000000000000000]
C2: type[C2] promotion[--] demotion[--]
latency[001] usage[00007058] duration[00000000000004263445]
C3: type[C3] promotion[--] demotion[--]
latency[057] usage[00411198] duration[00000000005664683387]
Thanks in advance for any tips on how to reduce power consumption,
Kai
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