Ubuntu
linux package

  1. Bug #1824216
  2. Comment #6

Comment 6 for bug 1824216

Revision history for this message
Robert Strube (robstrube) wrote : Re: Linux 5.0 regression i915 module, black screen on boot for certain laptop panels

Here are the relevant portions of my dmesg with drm.debug=14 as a boot paramater. You can see my laptops display panel is still failing link training.

21:00:11 kernel: [drm:intel_dp_get_link_train_fallback_values [i915]] Retrying Link training for eDP with same parameters
21:00:11 kernel: [drm:intel_dp_start_link_train [i915]] [CONNECTOR:85:eDP-1] Link Training failed at link rate = 324000, lane count = 1
21:00:11 kernel: [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
21:00:11 kernel: [drm:intel_dp_program_link_training_pattern [i915]] Using DP training pattern TPS1
21:00:11 kernel: [drm:intel_dp_set_signal_levels [i915]] Using pre-emphasis level 0
21:00:11 kernel: [drm:intel_dp_start_link_train [i915]] Using LINK_RATE_SET value 04