[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 #15 from Sriram Periyasamy <sriramx.periyasamy at intel.com> ---
(In reply to Jan Hoffmann from comment #0)
> Created attachment 135529 [details]
> dmesg: Dock DP connector with converter
> 
> I'm using a T460 with the Thinkpad Ultra Dock (contains Synaptics DP MST
> hub) and  a DP-HDMI converter (CAC-1070, based on PS176) to connect a 4K TV.
> 
> In this configuration the DP audio output is detected, but no audio can
> actually be heard. When connecting directly via HDMI or using the converter
> on the internal DP port of the laptop, audio works fine.
> 
> I have attached the dmesg output with drm.debug=0xe for the following test
> cases:
> 
> Dock DP connector with converter -> no audio
> Internal DP connector with converter -> audio works
> Dock HDMI connector -> audio works
> Internal HDMI connector -> audio works

are you able to hear the audio when connected without a converter, directly
from dock DP port to DP monitor?.

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