[Bug 283100] [NEW] powertop shows kwin generating lots of wakeups (intrepid, kde4)

[Julian Edwards]

Public bug reported:

Binary package hint: kdebase

>From powertop:

  20.3% ( 83.3)          knotify4 : schedule_timeout (process_timeout)
  17.6% ( 72.4)       <interrupt> : i915 at pci:0000:00:02.0
  14.8% ( 60.7)              kwin : schedule_timeout (process_timeout)
  10.3% ( 42.3)           firefox : futex_wait (hrtimer_wakeup)
   9.3% ( 38.1)       <interrupt> : extra timer interrupt
   3.9% ( 16.0)      <kernel IPI> : Rescheduling interrupts
   3.9% ( 16.0)   <kernel module> : usb_hcd_poll_rh_status (rh_timer_func)

It looks like it's waking up at the same frequency that my screen is
getting refreshed (60Hz), which is roughly in line with the interrupts
on the intel Xorg driver.

This is obviously bad for laptop power consumption.  On Hardy, I had ~80
wakeups/second total at idle so this is quite a regression.

** Affects: kdebase (Ubuntu)
     Importance: Undecided
         Status: New

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powertop shows kwin generating lots of wakeups (intrepid, kde4)
https://bugs.launchpad.net/bugs/283100
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