It looks the same bug on my Linux Mint 19.2 Cinnamon, Linux Kernel:
4.15.0-72-generic
Using second second monitor with NVIDIA Corporation GF108M [GeForce GT 525M]
graphics.
The error log is on tty1 console:
[drm:intel_set_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder
A FIFO underrun
[drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch
fifo underrun on pch transcoder A
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https://bugs.launchpad.net/bugs/1550779
Title:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
FIFO underrun
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