I can confirm that logging out and then logging in also resolves the
issue for me.
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https://bugs.launchpad.net/bugs/1684240
Title:
Mouse pointer behaves strangely
I am also experiencing the exact same issue on KDE Neon 5.10.4 and
nvidia-384.59, and switching to Xrender also fixes it for me.
Note that for me turning off compositing while using OpenGL 3.1 had a
salutory effect but did not completely resolve the problem. For
example, chromium still showed the
