[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 #104 from Achilles <lqvnguyen at hotmail.com> ---
(In reply to Libin Yang from comment #103)
> 
> > 
> > If I may add, Dolby Digital and DTS passthrough works and Stereo PCM works.
> > These are all limited to 1.5Mbps per the S/PDIF specs. Is it possible DP is
> > being subjected to the limits of the S/PDIF specs in the DRM driver?
> > 
> 
> Dolby Digital and DTS is not HBR audio and it should always work.
> 
> For this issue, I think we should make sure whether audio driver support HBR
> audio or not. In my opnion, both Audio driver and gfx driver need some
> patches to support HBR audio. I don't think only effort in gfx driver can
> make HBR audio work if audio driver doesn't support HBR audio.
> 
> > Per Wikipedia:
> > S/PDIF can carry two channels of uncompressed PCM audio or compressed
> > 5.1/7.1 surround sound (such as DTS audio codec); it cannot support lossless
> > formats (other than 2ch LPCM) such as Dolby TrueHD and DTS-HD Master Audio,
> > that require greater bandwidth[2] like that available with HDMI or
> > DisplayPort.
> 
> Yes, this is the same status 2 years before we did the test.
As long as we can move forward and get to a resolution is what is important. I
understand the Intel dev to user ration is highly unbalanced. I want to thank
you guys for the momentum this ticket has made over the course of the last few
days.

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