Re: Bug 103796 - 4.9.62: intermittent flicker after upgrade from 4.9.61

From: Rainer Fiebig
Date: Fri Nov 17 2017 - 17:59:40 EST

Yes, it's the i915-backports that cause the problem:

- diff --git a/drivers/gpu/drm/i915/intel_pm.c
ÂÂ Âindex 49de476..277a802 100644
- diff --git a/drivers/gpu/drm/i915/intel_drv.h
ÂÂ Âindex 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