[Bug 1002811] Re: sleep() call causing unnecessary wake ups

[Steve Langasek]

** Description changed:

  In the xevent processing thread there is a conditional sleep() call when
  the event queue is empty. This is unnecessary as the used XNextEvent
  function blocks on an empty queue. The sleep call thus causes an
  unnecessary wake up every 2 seconds preventing CPU sleep and consuming
  CPU time for no good reason.
  
  This is easily resolved by removing the bogus loop.
  
+ [Test Case]
  Reproduce:
  * make sure xsettings-kde is running
  * use sudo powertop
  * observe that xsettings-kde is having 0.5 events/second (one event every 2 seconds) and causes CPU usage of (on my system) 14us
  
  Fixed:
  * in powertop xsettings-kde does not have any events most of the time, using no CPU (or it is not showing up at all)

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https://bugs.launchpad.net/bugs/1002811

Title:
  sleep() call causing unnecessary wake ups

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