<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [KBL] intel NUC6CAYH no LSPCON HDMI audio output" href="https://bugs.freedesktop.org/show_bug.cgi?id=101583#c33">Comment # 33</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [KBL] intel NUC6CAYH no LSPCON HDMI audio output" href="https://bugs.freedesktop.org/show_bug.cgi?id=101583">bug 101583</a> from <a class="email" href="mailto:jnuzman@gmail.com" title="Joseph Nuzman <jnuzman@gmail.com>"> Joseph Nuzman</a> <pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=101583#c32">comment #32</a>) > The original reason for that has been clear all along: With LSPCON the port > looks like DP to the driver, but the ELD comes all the way from the display, > which is HDMI. > > So I didn't track down all the paths in your description or your patch, but > is this really not enough: > > <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [BXT/KBL] - HDMI - HD audio passthrough dont work" href="show_bug.cgi?id=98797#c94">https://bugs.freedesktop.org/show_bug.cgi?id=98797#c94</a> No. The ELD does not come directly from the display. The ELD is built from the EDID by the drm_edid_to_eld routine. This routine explicitly clears the conn_type field (effectively leaving the conn_type set as "HDMI", regardless of the monitor). The graphics driver is supposed to fill in the conn_type field. At least in my setup, that is done correctly by the intel_audio_codec_enable routine. (It sets conn_type of DP, as it is talking to the LSPCON.) The problem is, after intel_audio_codec_enable sets the conn_type field, the entire ELD is overwritten by subsequent invocations of drm_edid_to_eld. It is this overwritten version of ELD that makes its way to the audio driver.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>