I'm currently running latest Ubuntu version and it didn't happen to me for 
quite some time now:
Linux ZALANDO-27144 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 
2018 x86_64 x86_64 x86_64 GNU/Linux

I can't recall with which update it went away, sorry.

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https://bugs.launchpad.net/bugs/1777863

Title:
  [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI
  BUF C idle bit

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