Yes, it's the i915-backports that cause the problem:
- diff --git a/drivers/gpu/drm/i915/intel_pm.c
b/drivers/gpu/drm/i915/intel_pm.c
index 49de476..277a802 100644
- diff --git a/drivers/gpu/drm/i915/intel_drv.h
b/drivers/gpu/drm/i915/intel_drv.h
index a19ec06..3ce9ba3 100644
After reversing *both* (else the kernel won't compile) the flicker is
gone, no more messages in dmesg. All else OK so far.
Please do yourself and us users with older Intel CPU/GPU a favour and
don't backport i915-stuff anymore for 4.9! It's risky and probably
needless: until 4.9.60/61 everything was absolutely fine.
Keep in mind that 4.4 is also unusable with those processors b/c of
i915-problems (as you probably know).
And I have a premonition now concerning 4.14. ;)
--
The truth always turns out to be simpler than you thought.
Richard Feynman
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