** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1763271

Title:
  [8086:3e92] display becomes blank after S3

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  New
Status in linux-oem package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  New
Status in linux-oem source package in Xenial:
  Fix Committed

Bug description:
  [Impact]
  The display becomes black after S3 with the following error messages.

  dmesg:
  [ 60.546305] [drm:intel_dp_start_link_train [i915]] Link Training failed at 
link rate = 540000, lane count = 4

  Xorg.0.log:
  [ 60.748] (EE) modeset(0): failed to set mode: Invalid argument
  [ 60.748] (WW) modeset(0): hotplug event: connector 48's link-state is BAD, 
tried resetting the current mode. You may be left with a black screen if this 
fails...

  [Fix]
  Looks like link training fallback fails sometimes with eDP, we need this 
commit to fix the issue.

  commit a306343bcd7df89d9d45a601929e26866e7b7a81 (refs/bisect/bad)
  Author: Manasi Navare <manasi.d.nav...@intel.com>
  Date: Thu Oct 12 12:13:38 2017 -0700

      drm/i915/edp: Do not do link training fallback or prune modes on
  EDP

  [Regression Potential]
  Should be low.
  To avoid conflicts, we introduce 4 commits, I'll try explaining them below

  a306343 drm/i915/edp: Do not do link training fallback or prune modes on EDP
     This is the fix commit and the behavior only changes when DP is eDP, it 
does nothing if DP is eDP. Should be fine to not do link training fallback and 
not emit Hotplug Uevent to userspace to start modeset, since its eDP, the 
display is fixed.

  1853a9d drm/i915/dp: make is_edp non-static and rename to intel_dp_is_edp
  7b91bf7 drm/i915/dp: rename intel_dp_is_edp to intel_dp_is_port_edp
     Above 2 commits do function name renaming only.

  dc911f5 drm/i915/edp: Allow alternate fixed mode for eDP if available.
     Change the prototype of function "intel_panel_init()" and adding one extra 
argument, should have small impact on the display.

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