[Bug 109959] REGRESSION: black screen with linux 5.0 when starting X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109959

--- Comment #14 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Ville Syrjala from comment #13)
> [    4.724103] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:85:eDP-1]
> Link Training failed at link rate = 432000, lane count = 1
> [    4.724139] [drm:intel_dp_modeset_retry_work_fn [i915]]
> [CONNECTOR:85:eDP-1]
> ...
> [    5.863904] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:85:eDP-1]
> Link Training failed at link rate = 324000, lane count = 1
> [    5.863939] [drm:intel_dp_get_link_train_fallback_values [i915]] Retrying
> Link training for eDP with same parameters
> ...
> 
> So link training no longer works for whatever reason.

Ah yes it's the fast and narrow vs. wide and slow thing.

[    3.263107] [drm:intel_dp_init_connector [i915]] eDP DPCD: 04 93 a6

So this is a eDP 1.4a sink, which means we'll go for the fast and narrow
instead of the old wide and slow apporach.

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