*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
It happens for me with kernel 4.8.0-34-generic #36~16.04.1-Ubuntu .
with xorg.conf from comment #129.
The flashs start to appear once there is the message pointed in #130, i.e.:
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun .
The message appears only once for the first flash and then the flash appear
more often but no more message in /var/log/kern.log. Adding drm.debug=14 does
not enable more messages in that case.
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https://bugs.launchpad.net/bugs/1522922
Title:
Screen flickering in Intel i915 driver
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