[alsa-devel] [pulseaudio-discuss] [PATCH 0/1] alsa: Make profiles' availability dynamic

[Raymond Yau]

2016-2-18 下午5:38於 "Bob Ham" <bob.ham at collabora.com>寫道：
>
> Make ALSA profiles stick around and update their availability if the
> HDMI ELD changes.  This alters the presence of card profiles quite
> dramatically.  Specifically, the existing autogeneration of profiles
> generates a large set of input/output mapping combinations and all of
> these combinations are reported by the API, marked as unavailable. To
> give an idea of the consequences, here is what pavucontrol looks like
> with this patch:
>
>   https://people.collabora.com/~rah/pavucontrol-unavailable-profiles.png
>
> Similarly, here is the output of "pactl list cards":
>
>   https://people.collabora.com/~rah/pactl-list-cards-output.txt
>

AFAIK,

1) mono is not supported by hda-intel
2) those desktop with three jacks at rear panel need retasking input jacks
to output jacks by changing control channel mode from 2ch to 6ch, you may
need to add hook for alsa devices to change the channel mode in alsa
HDA-Intel.conf
3) even HDMI codec support 8 channels, it still require your hdmi monitor
support multi channels