[Bug 111507] Unable to detect monitor modes connected to a TB16 Dell dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111507

--- Comment #10 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
(In reply to Ville Syrjala from comment #9)
> (In reply to Stanislav Lisovskiy from comment #7)
> > I've looked briefly into the log. There seems to be multiple DP MST
> > connectors detected and some modes were pruned as invalid.
> > 
> > Another thing is that if correspondent i915_display_info debugfs entry
> > doesn't display anything except this:
> > 
> > connector 118: type DP-5, status: connected
> > 	physical dimensions: 600x340mm
> > 	subpixel order: Unknown
> > 	CEA rev: 3
> > 
> > it means that it could not find an intel_encoder,
> 
> That's a clear bug in i915_display_info. It should still list the modes even
> if there's no encoder.

Yep, but there is this line:

if (!intel_encoder)
    return;

Have no clue why its there, probably it was added because in next few lines it
tries to display info based on intel_encoder->type. We could just move that
code:

seq_printf(m, "\tmodes:\n");
list_for_each_entry(mode, &connector->modes, head)
     intel_seq_print_mode(m, 2, mode);

before this condition, in order to display modes..

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