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

["ciphwn@gmail.com" <ciphwn@gmail.com>]

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!

Cipta