Top causes for wakeups:
  43.8% ( 26.0)               vdr : schedule_timeout (process_timeout) 
  19.2% ( 11.4)             klogd : ehci_work (ehci_watchdog) 
   5.1% (  3.0)       <interrupt> : uhci_hcd:usb1, uhci_hcd:usb2, uhci_hcd:usb3, uhci_hcd:usb4, ehci_hcd:usb5
   4.2% (  2.5)      <kernel IPI> : Rescheduling interrupts
   4.2% (  2.5)               vdr : futex_wait (hrtimer_wakeup)
   4.0% (  2.4)   USB device  5-4 : Digital TV Receiver (Digital TV Receiver)
   3.7% (  2.2)       <interrupt> : sata_via
   3.4% (  2.0)     <kernel core> : clocksource_register (clocksource_watchdog)
   2.7% (  1.6)       <interrupt> : eth0
   1.7% (  1.0)              ntpd : do_setitimer (it_real_fn)
   1.0% (  0.6)         kdvb-fe-0 : schedule_timeout (process_timeout)
   1.0% (  0.6)     <kernel core> : queue_delayed_work_on (delayed_work_timer_fn)
   1.0% (  0.6)         kdvb-fe-1 : schedule_timeout (process_timeout)
   0.8% (  0.5)          ifconfig : __netdev_watchdog_up (dev_watchdog)
   0.7% (  0.4)          events/0 : schedule_timeout (process_timeout)
   0.7% (  0.4)             khubd : dvb_usb_remote_init (delayed_work_timer_fn)
   0.7% (  0.4)             kirqd : schedule_timeout (process_timeout)
   0.3% (  0.2)     <kernel core> : inet_twsk_schedule (inet_twdr_hangman)
   0.3% (  0.2)        S40mountfs : start_this_handle (commit_timeout)
   0.3% (  0.2)     <kernel core> : page_writeback_init (wb_timer_fn)
   0.3% (  0.2)              init : schedule_timeout (process_timeout)
   0.3% (  0.2)     <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer)
   0.2% (  0.1)             crond : do_nanosleep (hrtimer_wakeup)
   0.2% (  0.1)           syslogd : do_setitimer (it_real_fn)