[Bug 103786] DP audio does not work with Thinkpad Ultra Dock and DP-to-HDMI converter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103786

--- Comment #14 from Abhijeet Kumar <abhijeet.kumar at intel.com> ---
AUD_PWRST(0x4c) 0x0fffffff Audio Power State(Function Group, Convertor, Pin
Widget)

The corresponding pin and converter(audio widgets) are not in D0 thus "no
audio".

I can see the monitor has audio support and i915 has enabled the audio codec.
[8.489083] [drm:intel_audio_codec_enable [i915]] ELD on [CONNECTOR:101:DP-4],
[ENCODER:89:DP-MST A]
[8.489114] [drm:hsw_audio_codec_enable [i915]] Enable audio codec on pipe A, 44
bytes ELD
[14.735364] [drm:drm_detect_monitor_audio [drm]] Monitor has basic audio
support


But i'm seeing there's no active encoder for DP MST:
[23.695602] [drm:i915_audio_component_get_eld [i915]] Not valid for port B
[23.695617] [drm:i915_audio_component_get_eld [i915]] Not valid for port B
[23.695628] [drm:i915_audio_component_get_eld [i915]] Not valid for port B
[23.695648] [drm:i915_audio_component_get_eld [i915]] Not valid for port C
[23.695659] [drm:i915_audio_component_get_eld [i915]] Not valid for port C
[23.695669] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
[23.695680] [drm:i915_audio_component_get_eld [i915]] Not valid for port D
[23.695692] [drm:i915_audio_component_get_eld [i915]] Not valid for port D

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