linux-kernel - [4.4-rc1][Regression] drm/i915: Check live status before reading edid

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Message-ID: <56CE22DB.6050108@canonical.com>
Date:	Wed, 24 Feb 2016 16:38:35 -0500
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	sonika.jindal@...el.com
Cc:	shashank.sharma@...el.com, rodrigo.vivi@...el.com,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [4.4-rc1][Regression] drm/i915: Check live status before reading edid

Hi Sonika,

A kernel bug report was opened against Ubuntu [0].  After a kernel
bisect, it was found that reverting the following commit resolved this bug:

commit 237ed86c693d8a8e4db476976aeb30df4deac74b
Author: Sonika Jindal <sonika.jindal@...el.com>
Date:   Tue Sep 15 09:44:20 2015 +0530

    drm/i915: Check live status before reading edid

The regression was introduced as of v4.4-rc1.

I was hoping to get your feedback, since you are the patch author.  Do
think increasing the number of tries in intel_hdmi_detect() is worth
trying?  Do you think gathering any additional data will help diagnose
this issue, or would it be best to submit a revert request?

Thanks,

Joe

[0] http://pad.lv/lp1543683