I can also say, that on my machine with Plasma 5.4 (Fedora 22) it is not
happening anymore.
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https://bugs.launchpad.net/bugs/1440210
Title:
KWin crashes multiple times a day and often h
Sebastian, I believe that you are experiencing different issue than this
bugzilla entry is about.
I'm experiencing the same symptoms as are described in first comment (Alt+Tab
unfreezes the desktop) and I can confirm, that `export KWIN_USE_BUFFER_AGE=0;`
solves this problem.
If this is not your