Testing on a lenovo S10 netbook revealed frequent unexplained acpi interrupts on an idle system. Using linux kernel 2.6.30, thinkpad-acpi not compiled in.
powertop --dump follows: Your CPU supports the following C-states : C1 C2 C4 Your BIOS reports the following C-states : C1 C2 C4 Cn Avg residency C0 (cpu running) ( 0.3%) polling 0.0ms ( 0.0%) C1 mwait 0.0ms ( 0.0%) C2 mwait 4.2ms ( 0.8%) C4 mwait 14.9ms (99.0%) P-states (frequencies) 1.60 Ghz 0.0% 1333 Mhz 0.9% 1067 Mhz 0.0% 800 Mhz 99.1% Wakeups-from-idle per second : 68.1 interval: 15.0s no ACPI power usage estimate available Top causes for wakeups: 31.9% ( 17.1) <interrupt> : acpi 22.1% ( 11.8) <kernel core> : hrtimer_start (tick_sched_timer) 18.7% ( 10.0) <kernel core> : timer_action (ehci_watchdog) 16.7% ( 8.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer) 2.2% ( 1.2) <kernel IPI> : Rescheduling interrupts 1.9% ( 1.0) ifconfig : add_timer (tg3_timer) 1.9% ( 1.0) <kernel core> : schedule_delayed_work_on (delayed_work_timer_fn) 1.9% ( 1.0) automount : hrtimer_start_range_ns (hrtimer_wakeup) 0.6% ( 0.3) clockspeed : hrtimer_start_range_ns (hrtimer_wakeup) 0.5% ( 0.3) <kernel core> : add_timer (neigh_periodic_timer) 0.4% ( 0.2) mpd : __netdev_watchdog_up (dev_watchdog) 0.4% ( 0.2) runsvdir : hrtimer_start_range_ns (hrtimer_wakeup) 0.1% ( 0.1) <interrupt> : eth0 0.1% ( 0.1) sshd : sk_reset_timer (tcp_write_timer) 0.1% ( 0.1) <kernel core> : __enqueue_rt_entity (sched_rt_period_timer) 0.1% ( 0.1) <kernel core> : page_writeback_init (wb_timer_fn) 0.1% ( 0.1) tcpserver : add_timer (death_by_timeout) 0.1% ( 0.1) sshd : add_timer (death_by_timeout) 0.1% ( 0.1) runit : hrtimer_start_range_ns (hrtimer_wakeup) A USB device is active 100.0% of the time: USB device 1-3 : Lenovo EasyCamera (BISON Corporation) Suggestion: Enable USB autosuspend by pressing the U key or adding usbcore.autosuspend=1 to the kernel command line in the grub config Recent USB suspend statistics Active Device name 100.0% USB device 1-5 : USB2.0-CRW (Generic) 100.0% USB device 1-3 : Lenovo EasyCamera (BISON Corporation) 0.0% USB device usb5 : UHCI Host Controller (Linux 2.6.30 uhci_hcd) 0.0% USB device usb4 : UHCI Host Controller (Linux 2.6.30 uhci_hcd) 0.0% USB device usb3 : UHCI Host Controller (Linux 2.6.30 uhci_hcd) 0.0% USB device usb2 : UHCI Host Controller (Linux 2.6.30 uhci_hcd) 100.0% USB device usb1 : EHCI Host Controller (Linux 2.6.30 ehci_hcd) _______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
