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Hi,
Do you mean the issue is caused by the patches 1480992519-108079-1-git-send-email-libin.yang@intel.com?
I don't know whether the issues are caused directly by the specific patches; without them, digital audio does not work at all in my setup. Using analog audio however does not have the problems mentioned in my first email.
I can't see which patches are included you mentioned in the link.
I am building my kernel from drm-tip. The relevant patches enabling DP M ST audio seem to be "ALSA: hda - add DP mst verb support" [0] as well as "ALSA: hda - add DP MST audio support" [1].
Do you know if the DP MST audio mode is used in your case?
I think it is used; at least dp/hdmi audio does not work at all without building against drm-tip. (the outputs are all stated as unplugged and unavailable in pavucontrol for example) Is there any way to know for sure?
Regards, Pascal
[0] https://cgit.freedesktop.org/drm-tip/commit/?id=13800f397ee3b4996f316b9c aa8482cb90edef0d [1] https://cgit.freedesktop.org/drm-tip/commit/?id=9152085defb6426ce8f9989c a27e4450daefbd89