linux-kernel - [BUG/REGRESSION] Screen flickering

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Date:	Tue, 12 May 2015 21:54:07 +0200
From:	Thomas Gummerer <t.gummerer@...il.com>
To:	dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Thomas Gummerer <t.gummerer@...il.com>, jan@...dor.com,
	Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
	Michael Leuchtenburg <michael@...shhome.org>,
	Matt Roper <matthew.d.roper@...el.com>
Subject: [BUG/REGRESSION] Screen flickering

Hi,

I noticed that on my machine the screen starts to flicker after I
suspend and resume my machine, on the main laptop display if an external
display is attached with kernel v4.1-rc1.  I tracked the regression down
to commit c9f038a1a592 ("drm/i915: Don't assume primary & cursor are
always on for wm calculation (v4)"), and sent a patch that fixes that
behavior at [1] about two weeks ago, although I'm not sure it's the
right thing to do, as I'm not very familiar with the code.  The same bug
still exists in vv4.1-rc3.

Jan Niehusmann confirmed the behavior, but there has been no further
discussion on the topic.  I also forgot to cc the people that were
involved in the patch that caused the regression (sorry about that).

Is there anything else that I can do to help fixing this issue?

Thanks,
Thomas

[1] http://lists.freedesktop.org/archives/intel-gfx/2015-April/065494.html
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