[Bug 398133] [NEW] powertop reports way too many wakeups in idle state (plasma-desktop)

[Khashayar Naderehvandi]

Public bug reported:

In just so many words, plasma-desktop is reported too cause too many wakeups/sec to be acceptable for laptop use. This is from a completely idle session.
KDE version is 4.3RC2 from Karmic.
System is an Asus N20A (core 2 duo, all intel gm45).

PowerTOP 1.11   (C) 2007, 2008 Intel Corporation

Collecting data for 15 seconds


< Detailed C-state information is not available.>
P-states (frequencies)                           
  2.00 Ghz     7.6%                              
  1.60 Ghz     0.5%                              
   800 Mhz    91.9%                              
Wakeups-from-idle per second : 250.2    interval: 15.0s
no ACPI power usage estimate available                 
Top causes for wakeups:                                
  57.0% (215.1)    plasma-desktop : hrtimer_start_range_ns (hrtimer_wakeup) 
  22.4% ( 84.7)       <interrupt> : iwlagn                                  
  13.3% ( 50.3)              kwin : hrtimer_start_range_ns (hrtimer_wakeup) 
   2.1% (  7.9)       <interrupt> : ahci                                    
   1.1% (  4.0)     <kernel core> : usb_hcd_poll_rh_status (rh_timer_func)  
   0.7% (  2.7)      <kernel IPI> : Rescheduling interrupts                 
[...]

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

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powertop reports way too many wakeups in idle state (plasma-desktop)
https://bugs.launchpad.net/bugs/398133
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