[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 #103 from Libin Yang <libin.yang at intel.com> ---


> 
> 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.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are on the CC list for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170812/3ad71bb5/attachment.html>