[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

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #30 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Jan Hoffmann from comment #28)
> (In reply to Jani Nikula from comment #25)
> > One possibility: The DP-HDMI converter PS176 requires manually setting the
> > AVI infoframes using DP AUX. This is what we do for the on-board LSPCON
> > chips; see commits 799a964ffe0b ("drm/i915: Write AVI infoframes for Parade
> > LSPCON") and 7cbf19fd54ff ("drm/i915: Write AVI infoframes for MCA LSPCON").
> 
> If that is the case, should the issue also exist when using the DP port on
> the laptop?
> 
> Audio works when the adapter is connected directly to the laptop (and has
> worked before these commits). The issue only exists when using the docking
> station DP port.

Right, this should rule out any problems in driving the converter, and points
at the DP MST hub.

Does DP audio (DP-to-DP, without adapters) work both via the hub and directly
through the laptop port?

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