[ltp] very high number of wakeups (and power consumption) on T60p

[Peter F. Patel-Schneider]

Has anyone run into problems with tens of thousands of wakeups that are
unexplained in powertop?  This does appear to be real as battery drain
does jump up about 30-40%.

Here is typical powertop output.  The machine was just about idle when
this measurement was taken.


    PowerTOP version 1.9       (C) 2007 Intel Corporation

Cn                Avg residency       P-states (frequencies)
C0 (cpu running)        (30.1%)         2.17 Ghz     5.1%
C1                0.0ms ( 0.0%)         1.67 Ghz     0.0%
C2                0.0ms (65.3%)         1333 Mhz     0.0%
C3                0.3ms ( 4.6%)         1000 Mhz    94.9%


Wakeups-from-idle per second : 46243.6  interval: 10.0s
Power usage (ACPI estimate): 26.5W (0.8 hours) (long term: 28.0W,/0.8h)

Top causes for wakeups:
  12.1% (  1.8)       <interrupt> : extra timer interrupt
   8.7% (  1.3)    wpa_supplicant : schedule_timeout (process_timeout)
   8.1% (  1.2)                 X : do_setitimer (it_real_fn)
   7.4% (  1.1)       <interrupt> : ahci
   6.7% (  1.0)       firefox-bin : futex_wait (hrtimer_wakeup)
   6.7% (  1.0)              tail : do_nanosleep (hrtimer_wakeup)
   6.7% (  1.0)   multiload-apple : schedule_timeout (process_timeout)
   6.7% (  1.0)   setroubleshootd : schedule_timeout (process_timeout)
   6.0% (  0.9)        atieventsd : schedule_timeout (process_timeout)
   3.4% (  0.5)       <interrupt> : eth0
   3.4% (  0.5)    NetworkManager : e1000_intr_msi (e1000_watchdog)
   3.4% (  0.5)          gconfd-2 : schedule_timeout (process_timeout)
   2.7% (  0.4)   gnome-power-man : schedule_timeout (process_timeout)
   2.0% (  0.3)   <kernel module> : neigh_table_init_no_netlink (neigh_periodic_
   2.0% (  0.3)     <kernel core> : neigh_table_init_no_netlink (neigh_periodic_timer) 



Peter F. Patel-Schneider