Public bug reported:
[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
9bdbd39 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.
4f4db42 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.
eed02c3 drm/i915/dp: make is_edp non-static and rename to intel_dp_is_edp
be39bc2 drm/i915/dp: rename intel_dp_is_edp to intel_dp_is_port_edp
Above 2 commits do function name renaming only.
** Affects: linux-oem (Ubuntu)
Importance: Undecided
Assignee: AceLan Kao (acelankao)
Status: In Progress
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https://bugs.launchpad.net/bugs/1763271
Title:
[8086:3e92] display becomes blank after S3
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