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

From: Jani Nikula
Date: Mon Feb 29 2016 - 04:34:12 EST

On Wed, 24 Feb 2016, Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx> wrote:
> 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@xxxxxxxxx>
> 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?

There are at least the following commits claiming to fix issues in the
above commit. Please make sure you have them.


commit 8d409cb3e8a24196be7271defafd4638f3e0b514
Author: Ville SyrjÃlà <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Wed Feb 10 19:59:05 2016 +0200

drm/i915: Fix hpd live status bits for g4x

commit 3d8acd1f667b45c531401c8f0c2033072e32a05d
Author: Gary Wang <>
Date: Wed Dec 23 16:11:35 2015 +0800

drm/i915: increase the tries for HDMI hotplug live status checking

commit 97f9010af05c15e0b7e6b4ef6ff8cb0ebb7e7715
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Fri Dec 11 19:44:15 2015 +0100

drm/i915: mdelay(10) considered harmful

commit 0f5a9be15797f78c9a34e432f26c796165b6e49a
Author: Imre Deak <imre.deak@xxxxxxxxx>
Date: Fri Nov 27 18:55:29 2015 +0200

drm/i915: take a power domain reference while checking the HDMI live status

Jani Nikula, Intel Open Source Technology Center