I have done a fresh Ubuntu 16.04 install and then I have installaed the
mainline kernel suggested, i.e. 4.6.0-040600rc6-generic.

I have tested all day long the machine and it seems there is no random
monitor shut-down anymore, nor "[drm:intel_cpu_fifo_underrun_irq_handler
[i915]] *ERROR*" in the kernel log.

It seems this problem has somehow been fixed.

Will update in case of new problems.

Thanks for your help.

** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1573120

Title:
  VGA monitor goes to sleep randomly in 16.04

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