On Wed, 24 Feb 2016, Joseph Salisbury joseph.salisbury@canonical.com 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@intel.com Date: Tue Sep 15 09:44:20 2015 +0530
drm/i915: Check live status before reading edidThe 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.
BR, Jani.
commit 8d409cb3e8a24196be7271defafd4638f3e0b514 Author: Ville Syrjälä ville.syrjala@linux.intel.com Date: Wed Feb 10 19:59:05 2016 +0200
drm/i915: Fix hpd live status bits for g4x
commit 3d8acd1f667b45c531401c8f0c2033072e32a05d Author: Gary Wang gary.c.wang@intel.com 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@ffwll.ch Date: Fri Dec 11 19:44:15 2015 +0100
drm/i915: mdelay(10) considered harmful
commit 0f5a9be15797f78c9a34e432f26c796165b6e49a Author: Imre Deak imre.deak@intel.com Date: Fri Nov 27 18:55:29 2015 +0200
drm/i915: take a power domain reference while checking the HDMI live status