I also observe problems with a flickering mouse and a weird rectaangle
around my mouse, when I use three monitors, with one beeing rotated by
90 degrees. Sometimes this also occurs when I don't rotate the screen.
The fix above doesn't help me.
Ubuntu 17.10, Display link driver 4.1 and Nvidia 390 open source driver
GPU: NVIDIA GT640M
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Mouse Flickering after adding 3rd Monitor
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