I frequently have plasma (5.4.3 in Kubuntu 15.10 Wily) issues on resume from suspend (wake from sleep). Often times plasma crashes but usually automatically restarts. This post is about a different issue - image corruption. Note that I have a 970M-based nVidia Optimus laptop running PRIME in nvidia mode. I don't run off the integrated GPU (intel) enough to notice the problem.
Sometimes a portion of the screen is corrupted. On my system this takes the form of a "snow" image, mostly white with lots of light-colored dots, reminding me of the snow image analog TVs would display when no signal was present.
Once, the "snow" was present in a Konsole window. The decorations and border were fine, but the actual console content was this snow image.
Other times, the desktop background was this snow image.
Interestingly, the functionality of the desktop remains unchanged. I can switch between desktops, move windows, etc. And compositing is still enabled, with my fancy desktop-cube switcher and wobbly windows. But, the background remained snowy.
The only way I found to fix it, short of logging out and back on, was by disabling compositing ("disable desktop effects" - shift-alt-F12). The background image was correctly displayed. I then re-enabled compositing and all was good.
Confusing, but there you have it. At least I didn't have to end my session and restart X!
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