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0f7b58d
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Kubuntu 16.04, KDE plasma 5.5.5, Qt 5.5.1
Using Sky Lake Integrated Graphics with driver=i915_bpo
Using dual monitors with different configurations and resolutions. On waking the screens the desktop shown on HDMI2 monitor crashes. The background is black and the KDE panel is gone. The primary display is unaffected. I am still able to run application windows on the crashed desktop and the app windows will take up the space of the missing panel. To resolve I run
killall plasmashell; sleep 3; plasmashell
This brings the desktop wallpaper and panel back as expected and application windows on the crashed desktop will resize to fit the panel.