[Bug 98797] [BXT/KBL] - HDMI - HD audio passthrough dont work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98797

--- Comment #73 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Igor Mammedov from comment #69)
> Are you sure it's LSPCON related issue?

That's my educated guess.

> It's true that there were LSPCON related problems in NUCs and that were
> fixed by it's firmware update.

An LSPCON firmware update fixing something isn't proof that there aren't other
LSPCON related issues in the drm drivers.

> Moreover I have 'ASUS P10S-M WS' with similar setup where internal DP port
> is connected through unknown convertor chip to HDMI output connector.
> Considering that this chip
> works fine (DTSHD passthrough) under Windows 10 without any firmware updates
> I would assume that it's not LSPCON chip, but HD-audio is broken in linux
> anyway. Also the board has additional DP output[1], which has the same
> HD-audio passthrough issues under linux but works fine under Windows.
> 
> Considering that issue affects other HW,
> I'd not limit BZ to LSPCON only as the problem is wider,
> so I'd keep BZ title as it's been before.
> it looks like DP is a common denominator on all boards that exhibit the
> problem regardless of internal/external convertor,
> so it looks like the place to start looking for issue.
> 
> 
> (1) - to connect DP output to HDMI reciever I use:
>         Club3D DisplayPort 1.2 Cable to HDMI 2.0 Active Adapter (P/N:
> CAC-1073)

AFAICT all of the scenarios you describe consist of an active protocol
converter. The same chips that are used for the internal LSPCON are used within
adapter cables.

Is anyone here experiencing issues with native DP or native HDMI, with no
active protocol converters in between?

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