After installing the linux-generic-hwe-16.04-edge (comment #2) and
reboot, the 'uname -a' shows the kernel is 4.8.0-28-generic, and with
this kernel, I can't see any warnings in the dmesg and can't see "screen
blank" as well when connecting or disconnecting an external monitor.
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[i915_bpo] Intermittent display outage with external monitor
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