Here's the powertop output for the siemens stick in various situations:
cheers -henrik
---------------------------- running zap to tune into a channel ---------------------------- and transfer the TS over USB
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies) C0 (cpu running) ( 5.8%) 750 Mhz 0.0% polling 0.0ms ( 0.0%) 563 Mhz 0.0% C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0% C2 0.1ms ( 0.0%) 188 Mhz 100.0% C3 1.9ms (94.2%)
Wakeups-from-idle per second : 486.1 interval: 10.0s no ACPI power usage estimate available
Top causes for wakeups: 55.3% (598.2) USB device 5-1 : DVB-T 2 (Afatech) 42.8% (462.3) <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel 0.5% ( 5.6) zap : schedule_timeout (process_timeout) 0.2% ( 2.3) events/0 : schedule_timeout (process_timeout) 0.2% ( 2.2) khubd : queue_delayed_work (delayed_work_timer_fn) 0.2% ( 2.0) xfsaild : schedule_timeout (process_timeout) 0.2% ( 2.0) kdvb-ad-0-fe-0 : schedule_timeout (process_timeout) 0.2% ( 1.8) xfsbufd : schedule_timeout (process_timeout) 0.1% ( 1.0) zap : do_nanosleep (hrtimer_wakeup) 0.1% ( 1.0) ifconfig : b44_open (b44_timer) 0.0% ( 0.5) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) 0.0% ( 0.5) <kernel core> : schedule_delayed_work_on (delayed_work_timer_fn) 0.0% ( 0.3) <kernel module> : neigh_table_init_no_netlink (neigh_periodic_timer) 0.0% ( 0.2) <interrupt> : uhci_hcd:usb3, eth0 0.0% ( 0.2) init : schedule_timeout (process_timeout) 0.0% ( 0.2) <kernel core> : __netdev_watchdog_up (dev_watchdog) 0.0% ( 0.2) runsvdir : schedule_timeout (process_timeout) 0.0% ( 0.1) screen : do_setitimer (it_real_fn) 0.0% ( 0.1) <kernel module> : <f8b4191b> (inet_frag_secret_rebuild) 0.0% ( 0.1) <kernel core> : addrconf_verify (addrconf_verify) 0.0% ( 0.1) nmbd : schedule_timeout (process_timeout)
Suggestion: Enable USB autosuspend by pressing the U key or adding usbcore.autosuspend=1 to the kernel command line in the grub config
Q - Quit R - Refresh U - Enable USB suspend
-------------------------------------- running vdr and having it idle around. -------------------------------------- i.e. not recording anything
jukebox:/home/data/static# /etc/init.d/vdr start Starting Linux Video Disk Recorder: vdr Searching for plugins (VDR 1.6.0-2/1.6.0) (cache hit): epgsearch femon dvdswitch quickepgsearch conflictcheckonly live epgsearchonly dvd ffnetdev streamdev-server xineliboutput.
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies) C0 (cpu running) (14.8%) 750 Mhz 0.0% polling 0.0ms ( 0.0%) 563 Mhz 0.0% C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0% C2 0.1ms ( 0.2%) 188 Mhz 100.0% C3 1.3ms (85.1%)
Wakeups-from-idle per second : 655.9 interval: 10.0s no ACPI power usage estimate available
Top causes for wakeups: 45.8% (606.2) USB device 5-1 : DVB-T 2 (Afatech) 35.6% (470.9) <interrupt> : uhci_hcd:usb1, ehci_hcd:usb5, HDA Intel 16.7% (220.9) vdr : futex_wait (hrtimer_wakeup) 0.7% ( 9.5) vdr : schedule_timeout (process_timeout) 0.2% ( 2.2) khubd : queue_delayed_work (delayed_work_timer_fn) 0.2% ( 2.2) events/0 : schedule_timeout (process_timeout) 0.2% ( 2.0) xfsaild : schedule_timeout (process_timeout) 0.2% ( 2.0) kdvb-ad-0-fe-0 : schedule_timeout (process_timeout) 0.1% ( 1.6) xfsbufd : schedule_timeout (process_timeout) 0.1% ( 1.0) vdr : do_nanosleep (hrtimer_wakeup) 0.1% ( 1.0) ifconfig : b44_open (b44_timer) 0.0% ( 0.5) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) 0.0% ( 0.5) <kernel core> : schedule_delayed_work_on (delayed_work_timer_fn) 0.0% ( 0.3) <kernel module> : neigh_table_init_no_netlink (neigh_periodic_timer) 0.0% ( 0.2) vdr : hrtick_set (hrtick) 0.0% ( 0.2) <kernel core> : __netdev_watchdog_up (dev_watchdog) 0.0% ( 0.2) xfssyncd : schedule_timeout (process_timeout) 0.0% ( 0.2) init : schedule_timeout (process_timeout) 0.0% ( 0.2) runsvdir : schedule_timeout (process_timeout) 0.0% ( 0.2) smbd : schedule_timeout (process_timeout) 0.0% ( 0.1) <kernel core> : neigh_add_timer (neigh_timer_handler)
Suggestion: Enable USB autosuspend by pressing the U key or adding usbcore.autosuspend=1 to the kernel command line in the grub config
----------------------------------------- just for comparison. vdr running without ehci_hcd and uhci_hcd ----------------------------------------- so there is no dvb device to get data from
PowerTOP version 1.10 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies) C0 (cpu running) ( 5.3%) 750 Mhz 0.0% polling 0.0ms ( 0.0%) 563 Mhz 0.0% C1 halt 0.0ms ( 0.0%) 375 Mhz 0.0% C2 0.1ms ( 0.0%) 188 Mhz 100.0% C3 4.6ms (94.7%)
Wakeups-from-idle per second : 206.7 interval: 10.0s no ACPI power usage estimate available
Top causes for wakeups: 92.7% (197.0) vdr : futex_wait (hrtimer_wakeup) 2.8% ( 6.0) vdr : schedule_timeout (process_timeout) 0.9% ( 2.0) xfsaild : schedule_timeout (process_timeout) 0.8% ( 1.6) xfsbufd : schedule_timeout (process_timeout) 0.5% ( 1.0) vdr : do_nanosleep (hrtimer_wakeup) 0.5% ( 1.0) ifconfig : b44_open (b44_timer) 0.3% ( 0.7) <interrupt> : ide0 0.2% ( 0.5) <kernel core> : schedule_delayed_work_on (delayed_work_timer_fn) 0.2% ( 0.5) <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) 0.2% ( 0.4) <kernel module> : ide_do_rw_disk (ledtrig_ide_timerfunc) 0.1% ( 0.3) <kernel module> : neigh_table_init_no_netlink (neigh_periodic_timer) 0.1% ( 0.2) <interrupt> : sata_sil24 0.1% ( 0.2) init : schedule_timeout (process_timeout) 0.1% ( 0.2) <kernel core> : __netdev_watchdog_up (dev_watchdog) 0.1% ( 0.2) xfssyncd : schedule_timeout (process_timeout) 0.1% ( 0.2) runsvdir : schedule_timeout (process_timeout) 0.0% ( 0.1) <kernel core> : end_that_request_last (laptop_timer_fn) 0.0% ( 0.1) pdflush : hrtick_set (hrtick) 0.0% ( 0.1) touch : start_this_handle (commit_timeout) 0.0% ( 0.1) nmbd : schedule_timeout (process_timeout) 0.0% ( 0.1) cron : do_nanosleep (hrtimer_wakeup)