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

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Message-ID: <e4794488-b5ed-2b8d-cb10-e767963fa3cb@mailbox.org>
Date:   Sat, 18 Nov 2017 00:00:26 +0100
From:   Rainer Fiebig <jrf@...lbox.org>
To:     linux-kernel@...r.kernel.org
Subject: Re: Bug 103796 - 4.9.62: intermittent flicker after upgrade from
 4.9.61

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