I was experiencing regular crashes and graphical glitching with KDE Plasma 5 after upgrading to 15.10 and after discovering this bug I decided to upgrade my kernel to the latest -wily version (http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.2.5-wily/). That seems to have corrected the issue. The glitching has gone away and no crashes so far after about 20 minutes of use with intensive WebGL utilization (which was what was causing the crashes previously).
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