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powertop reports frequent wakeups from PS/2 keyboard/mouse/touchpad

Hello everyone,

I installed Debian sid on my new Thinkpad T500 a few days ago and is now using powertop to check the power usage. When it's idle (hands off, no programs other than GNOME) it's not bad:
Wakeups-from-idle per second : 43.0     interval: 15.0s
no ACPI power usage estimate available

Top causes for wakeups:
26.0% ( 10.3) gnome-settings- : schedule_hrtimeout_range (hrtimer_wakeup)
  25.3% ( 10.0)     <kernel core> : mod_timer (ehci_watchdog)
  17.6% (  6.9)       <interrupt> : extra timer interrupt
However, when I tried moving the trackpoint in a circular motion until it updates:
Wakeups-from-idle per second : 679.9    interval: 10.0s
no ACPI power usage estimate available

Top causes for wakeups:
  63.9% (499.9)       <interrupt> : PS/2 keyboard/mouse/touchpad
  12.1% ( 94.6)      <kernel IPI> : Rescheduling interrupts
6.0% ( 46.9) <interrupt> : firewire_ohci, uhci_hcd:usb7, HDA Intel
In short, the number of wakeups jumps from below 50 to almost 700, with over half coming from what seems to be the keyboard/mouse driver. Is this normal? Using the touchpad results in the same behavior, using the keyboard will increase total interrupts to 200-300.

This is debian sid with up-to-date packages.
cipta@gurame:~$ uname -a
Linux gurame 2.6.29-1-amd64 #1 SMP Fri Apr 17 10:12:36 UTC 2009 x86_64 GNU/Linux

Thanks in advance!


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