Hello,
I've tried powertop 1.5 on a Thinkpad X31 / Debian Etch with a
2.6.21-4 Debian kernel (having NO_HZ configured), and it report that
the processor, a Pentium M, never go in C3 nor C4 modes :-( :
PowerTOP version 1.5 (C) 2007 Intel Corporation
Cn Avg residency (3s) Long term residency avg
C0 (cpu running) ( 3.4%)
C1 0.0ms ( 0.0%) 0.0ms
C2 5.5ms (96.6%) 4.4ms
C3 0.0ms ( 0.0%) 0.0ms
C4 0.0ms ( 0.0%) 0.0ms
Wakeups-from-idle per second : 175.7
Power usage (ACPI estimate) : 9.9 W (1.3 hours left)
Top causes for wakeups:
23.6% ( 60.3) <interrupt> : yenta, yenta, [EMAIL
PROTECTED]:0000:01:00.0, Intel 10.2% ( 26.0) <interrupt> : i8042 th0,
ehci_hcd:usb1, uhci_hcd:usb2, uhc 5.0% ( 12.7) gnome-screensav :
schedule_timeout (process_timeout)
4.8% ( 12.3) fast-user-switc : schedule_timeout (process_timeout)
4.8% ( 12.3) Xorg : do_setitimer (it_real_fn)
4.7% ( 12.0) gnome-vfs-daemo : schedule_timeout (process_timeout)
Suggestion: enable the HPET (Multimedia Timer) in your BIOS or add
the kernel patch to force-enable HPET. HPET support allows Linux to
have much longer sleep intervals.
Q - Quit R - Refresh
I wonder what to do to let it enters these powersaving modes ?
About the suggestion, I don't know if my laptop (an old one, from
2003) has ever some "HPET" ?
--
Frédéric
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