kwin (4.11.12) idle CPU usage

Duncan 1i5t5.duncan at
Tue Jan 26 17:20:38 GMT 2016

Nikos Chantziaras posted on Tue, 26 Jan 2016 17:50:05 +0200 as excerpted:

> Anyway, since you configured top to not update every second, then,
> indeed something is fishy.


> There's a "Show paint" desktop effect which
> shows which areas of the screen kwin is repainting. I've no idea how to
> interpret the results though. The screen just has weird flashing colors
> with no indications where the repaints are...

Those weird flashing colors /are/ the indications of where the repaints 
are.  Every time a repaint occurs, the color of an area changes, so the 
more flashing you see and the bigger area that's flashing, the more 
repainting is being done and the higher both kwin_x11 and X's usage 
should be.

Given that he said quitting Chrome dramatically reduced kwin's CPU usage, 
I'd guess that with this effect enabled, Chrome will be flashing like 

(Tho FWIW I use firefox, not chrome, which I couldn't use in any case as 
it's servantware and I couldn't agree to the EULA, etc.  I'd use chromium 
if I were to switch to a chrome-family browser, as at least chromium is 

Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

This message is from the kde mailing list.
Account management:
More info:

More information about the kde mailing list