[Bug 92878] Black screen after backlight is off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92878

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #3 from Jani Nikula <jani.nikula at intel.com> ---
Please try this patch on top of current drm-intel-nightly:

diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c
b/drivers/gpu/drm/i915/intel_dp_link_training.c
index 88887938e0bf..ea83d02b3528 100644
--- a/drivers/gpu/drm/i915/intel_dp_link_training.c
+++ b/drivers/gpu/drm/i915/intel_dp_link_training.c
@@ -234,8 +234,10 @@ intel_dp_link_training_channel_equalization(struct
intel_dp *intel_dp)
     if (intel_dp_source_supports_hbr2(intel_dp) &&
         drm_dp_tps3_supported(intel_dp->dpcd))
         training_pattern = DP_TRAINING_PATTERN_3;
-    else if (intel_dp->link_rate == 540000)
+    else if (intel_dp->link_rate == 540000) {
+        training_pattern = DP_TRAINING_PATTERN_3;
         DRM_ERROR("5.4 Gbps link rate without HBR2/TPS3 support\n");
+    }

     /* channel equalization */
     if (!intel_dp_set_link_train(intel_dp,

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