Finally, I had time to test it with linux 4.8.0-040800.201610022031
amd64 and with the 4.8.0-22 versions. In both cases the problem still
exists. However, the content of the black rectangle has changed. It now
includes the first line of the console frame buffer (in a slightly
distorted way).

The bug #1611124 might be 
related, as I get the same error with 
W: Possible missing firmware /lib/firmware/i915/kbl_guc_ver9_14.bin for module 
W: Possible missing firmware /lib/firmware/i915/bxt_guc_ver8_7.bin for module 

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  Dual monitor - screen flashes and turns black on mouse movement and
  keyboard input

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