[Bug 89419] [SKL][Audio][HD-A Display]: Can't detect Display audio codec if not connect HDMI and DP monitor when boot up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89419

--- Comment #15 from Libin Yang <libin.yang at intel.com> ---
Hi Imre,

Based on my experience, EM4/5 impacts on the playback speed, I don't think it
will impact on the audio codec detection. (Actually before we detect HDMI
codec, we will never touch such registers)

For the power well, yes, we need set the power well before HDMI codec
detection. And the audio driver does do it already.

After power well on, we will do the HDMI codec detection. We won't power off
the power well before HDMI codec detection.

BTW: I have asked the BIOS team about this issue. They told me that we should:
1. update the BIOS to latest (we have already done)
2. update the gfx driver to latest(windows). So I believe that BIOS may have
changed some interfaces with gfx for this issue. Maybe we missed the change?

Thanks,
Libin

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