Having the same problem on a Dell XPS 13 9343 running Ubuntu Gnome 15.10
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https://bugs.launchpad.net/bugs/1504362
Title:
Desktop flashes briefly on resume before going to lock screen
T
I have the same issue in Ubuntu 15.10 (wily). So far I have only been
able to reproduce this when using a second external monitor, not when
using my laptop only.
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