My guess is this commit fixes the issue:
commit 368b554d63948133aca05e63ff8f5f4fbc2804d4
Author: Jani Nikula <[email protected]>
Date: Wed May 16 11:01:10 2018 +0300
Revert "drm/i915/edp: Allow alternate fixed mode for eDP if available."
This reverts commit dc911f5bd8aacfcf8aabd5c26c88e04c837a938e.
Can you try Bionic's kernel or Mainline kernel to see if the issue is
fixed?
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Title:
Mouse cursor having a longer trail, lagging and stuttering
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