[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 #42 from Jan Hoffmann <jan at 3e8.eu> ---
I tested with another adapter, the CAC-1080 (which apparently uses a MCDP2900
converter chip). With this adapter, audio works fine.

However, with the CAC-1080, 4K video at 60 Hz only works reliably on the laptop
DP port. When connected through the MST hub in the docking station, the highest
stable setting seems to be 3840x2160 at 23.98 Hz. Anything higher results in
the display showing nothing or a broken picture (sound can sometimes be heard
though).

Similar to the CAC-1070, everything works without issues on Windows.

So both adapters work fine on the internal DP port, but fail in different ways
when connected via the docking station.

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